一、状语从句中的when

　　when用作从属连词，引导时间状语从句，意为“当……的时候”，从句的谓语可以是延续性动词或非延续性动词。when引导的时间状语从句要用一般现在时(或现在完成时)代替将来时。

　　Because of the heavy traffic, it was already time for lunch break _____ she got to her office. (2010四川)

　　A. since B. that

　　C. when

　　D. until

　　C。句意：因为交通拥挤，当她到达办公室时已是午休时间了。when引导时间状语从句，意为“当……的时候”，符合句意。

　　此外，when还可以引导条件、原因、让步等状语从句。

　　How can you expect to learn anything _____ you never listen? (2006山东)

　　A. in case B. even if C. unless D. when

　　D。when意为“既然，考虑到”，符合句意。in case以免，以防；even if即使；unless除非。

　　when

　　when用作并列连词，意为“正在这时；突然”，常用在以下句式中：

　　(1) 过去进行时(延续性动词)+when+一般过去时，意为“正在做某事，这时发生了另外一件事”；(2) be about to do… when+一般过去时，意为“正要做某事，这时发生了另外一件事”；(3) 过去完成时(非延续性动词)+when+一般过去时，意为 “刚刚做完某事，突然发生了另外一事”。

　　1. Tom was about to close the window _____ his attention was caught by a bird. (2010全国II)

　　A. when

　　B. if

　　C. and

　　D. till

　　2. She had just finished her homework _____ her mother asked her to practise playing the piano yesterday.

　　(2009福建)

　　A. when

　　B. while

　　C. after

　　D. since

　　3. Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by a lion. (2004上海)

　　A. when

　　B. while

　　C. since

　　D. once

　　1. A。符合句式(2)。2. A。符合句式(3)。3. A。符合句式(1)。

　　when

　　when用作连接副词，引导名词性从句，并在从句中作时间状语。

　　1. A good friend of mine from _____ I was born showed up at my home right before I left for Beijing. (2009安徽)

　　A. how

　　B. whom

　　C. when

　　D. which

　　2. The last time we had great fun was _____ we were visiting the Water Park.

　　(2008天津)

　　A. where

　　B. how

　　C. when

　　D. why

　　3. Please remind me _____ he said he was going. I may be in time to see him off.

　　(2006全国I)

　　A. where

　　B. when

　　C. how

　　D. what

　　4. As soon as he comes back, I’ll tell him when _____ and see him.

　　(2005北京)

　　A. you will come

　　B. will you come

　　C. you come

　　D. do you come

　　【简析】1. C。句意：就在我动身去北京前，我自出生起就认识的一位好朋友出现在我家里。when引导宾语从句，作介词from的宾语，构成介词短语作后置定语，修饰friend。2. C。when引导表语从句，与前面的the last time对应。3. B。从后文中的be in time可知选B。4. A。宾语从句要用陈述语序，可排除B和D；when引导宾语从句，根据意思要用将来时，故选A。

　　when

　　when用作关系副词引导定语从句，修饰表示时间的名词，并在从句中作时间状语,相当于at/on/in which。

　　1. Because of the financial crisis, days are gone _____ local 5-star hotels charged 6,000 yuan for one night.

　　(2009江苏)

　　A. if

　　B. when

　　C. which

　　D. since

　　2. She’ll never forget her stay there _____ she found her son who had gone missing two years before. (2009四川)

　　A. that

　　B. which

　　C. where

　　D. when

　　1. B。句意：因为金融危机，五星级饭店一夜收取6000元费用的日子一去不复返了。days是先行词，定语从句中缺少时间状语，故用when, 选B。本句中先行词与定语从句被谓语are gone隔开，增加了试题的难度。2. D。先行词是stay，定语从句中缺少时间状语，故用when, 选D。

　　when从句的省略

　　when引导时间状语从句时，如果主句的主语和从句的主语一致或从句主语为it，且从句中的谓语部分含有be的形式，可将从句主语和be省略，只保留分词短语、形容词短语或介词短语等。

　　When _____ help, one often says “Thank you.” or “It’s kind of you.”

　　(2005福建)

　　A. offering

　　B. to offer

　　C. to be offered

　　D. offered

　　D。从句中的主语承后省略，offer的主语是one, 故用被动语态。When offered help=When one is offered help。

　　when构成的固定搭配

　　when构成一些常见搭配，如when it comes to... 当涉及到……, hardly... when...一……就……，no matter when... 不管什么时候。如：

　　No matter when you come, you will be welcome.不管你什么时候来，都欢迎。

　　Most of us know we should cut down on fat. But knowing such things isn’t much help when it _____ shopping and eating. (2006天津)

　　A. refers to

　　B. speaks of

　　C. focuses on

　　D. comes to

　　D。when it comes to…是固定句式，意为“当谈及到……；当涉及到……”。其中to是介词，后接名词或动词-ing形式。如： When it comes to educating the kids, he kept silent.当谈及到教育孩子时，他一言不发。

　　1. — When _____ and visit our exhibition next month?

　　—When _____, I’ll let you know.

　　A. will he come; he will come

　　B. will he come; he comes

　　C. does he come; he will come

　　D. does he come; he comes

　　2. It was an exciting moment for these Spanish football fans this year, _____ for the first time in years their team won the World Cup championship.

　　A. which

　　B. that

　　C. while

　　D. when

　　3. When _____ with difficulties, she ran away.

　　A. faced

　　B. facing

　　C. face

　　D. to face

　　4. — Did you remember the days _____ we worked on the farm?

　　— Certainly. Especially the hard times _____ we spent together.

　　A. which; when

　　B. when; which

　　C. when; when

　　D. which; which

　　5. When I was at college, I _____ three foreign languages, but I _____ all except a few words of each.

　　A. spoke; had forgotten

　　B. spoke; have forgotten

　　C. had spoken; had forgotten

　　D. had spoken; have forgotten

　　6. When _____ the prices of these goods, we must take everything into consideration.

　　A. compared

　　B. having compared

　　C. comparing

　　D. compare

　　7. I shall never forget those years _____ I lived in the countryside with my friends, _____ has a great effect on my life.

　　A. where; which

　　B. when; which

　　C. which; that

　　D. when; that

　　8. It was in 1993 _____ he was at college _____ he joined the Party.

　　A. that; that

　　B. when; when

　　C. that; when

　　D. when; that

　　9. _____ had he arrived home _____ it began to rain.

　　A. Hardly; when

　　B. Not; until

　　C. No sooner; when

　　D. No sooner; before

　　10. _____ there is no gravity, our feet can no longer stay on the ground.

　　A. Since

　　B. When

　　C. While

　　D. As

　　Key：

　　1-5 BDABB

　　6-10 CBDAB

　　一、状语从句中的when

　　when用作从属连词，引导时间状语从句，意为“当……的时候”，从句的谓语可以是延续性动词或非延续性动词。when引导的时间状语从句要用一般现在时(或现在完成时)代替将来时。

　　Because of the heavy traffic, it was already time for lunch break _____ she got to her office. (2010四川)

　　A. since B. that

　　C. when

　　D. until

　　C。句意：因为交通拥挤，当她到达办公室时已是午休时间了。when引导时间状语从句，意为“当……的时候”，符合句意。

　　此外，when还可以引导条件、原因、让步等状语从句。

　　How can you expect to learn anything _____ you never listen? (2006山东)

　　A. in case B. even if C. unless D. when

　　D。when意为“既然，考虑到”，符合句意。in case以免，以防；even if即使；unless除非。

　　when

　　when用作并列连词，意为“正在这时；突然”，常用在以下句式中：

　　(1) 过去进行时(延续性动词)+when+一般过去时，意为“正在做某事，这时发生了另外一件事”；(2) be about to do… when+一般过去时，意为“正要做某事，这时发生了另外一件事”；(3) 过去完成时(非延续性动词)+when+一般过去时，意为 “刚刚做完某事，突然发生了另外一事”。

　　1. Tom was about to close the window _____ his attention was caught by a bird. (2010全国II)

　　A. when

　　B. if

　　C. and

　　D. till

　　2. She had just finished her homework _____ her mother asked her to practise playing the piano yesterday.

　　(2009福建)

　　A. when

　　B. while

　　C. after

　　D. since

　　3. Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by a lion. (2004上海)

　　A. when

　　B. while

　　C. since

　　D. once

　　1. A。符合句式(2)。2. A。符合句式(3)。3. A。符合句式(1)。

　　when

　　when用作连接副词，引导名词性从句，并在从句中作时间状语。

　　1. A good friend of mine from _____ I was born showed up at my home right before I left for Beijing. (2009安徽)

　　A. how

　　B. whom

　　C. when

　　D. which

　　2. The last time we had great fun was _____ we were visiting the Water Park.

　　(2008天津)

　　A. where

　　B. how

　　C. when

　　D. why

　　3. Please remind me _____ he said he was going. I may be in time to see him off.

　　(2006全国I)

　　A. where

　　B. when

　　C. how

　　D. what

　　4. As soon as he comes back, I’ll tell him when _____ and see him.

　　(2005北京)

　　A. you will come

　　B. will you come

　　C. you come

　　D. do you come

　　【简析】1. C。句意：就在我动身去北京前，我自出生起就认识的一位好朋友出现在我家里。when引导宾语从句，作介词from的宾语，构成介词短语作后置定语，修饰friend。2. C。when引导表语从句，与前面的the last time对应。3. B。从后文中的be in time可知选B。4. A。宾语从句要用陈述语序，可排除B和D；when引导宾语从句，根据意思要用将来时，故选A。

　　when

　　when用作关系副词引导定语从句，修饰表示时间的名词，并在从句中作时间状语,相当于at/on/in which。

　　1. Because of the financial crisis, days are gone _____ local 5-star hotels charged 6,000 yuan for one night.

　　(2009江苏)

　　A. if

　　B. when

　　C. which

　　D. since

　　2. She’ll never forget her stay there _____ she found her son who had gone missing two years before. (2009四川)

　　A. that

　　B. which

　　C. where

　　D. when

　　1. B。句意：因为金融危机，五星级饭店一夜收取6000元费用的日子一去不复返了。days是先行词，定语从句中缺少时间状语，故用when, 选B。本句中先行词与定语从句被谓语are gone隔开，增加了试题的难度。2. D。先行词是stay，定语从句中缺少时间状语，故用when, 选D。

　　when从句的省略

　　when引导时间状语从句时，如果主句的主语和从句的主语一致或从句主语为it，且从句中的谓语部分含有be的形式，可将从句主语和be省略，只保留分词短语、形容词短语或介词短语等。

　　When _____ help, one often says “Thank you.” or “It’s kind of you.”

　　(2005福建)

　　A. offering

　　B. to offer

　　C. to be offered

　　D. offered

　　D。从句中的主语承后省略，offer的主语是one, 故用被动语态。When offered help=When one is offered help。

　　when构成的固定搭配

　　when构成一些常见搭配，如when it comes to... 当涉及到……, hardly... when...一……就……，no matter when... 不管什么时候。如：

　　No matter when you come, you will be welcome.不管你什么时候来，都欢迎。

　　Most of us know we should cut down on fat. But knowing such things isn’t much help when it _____ shopping and eating. (2006天津)

　　A. refers to

　　B. speaks of

　　C. focuses on

　　D. comes to

　　D。when it comes to…是固定句式，意为“当谈及到……；当涉及到……”。其中to是介词，后接名词或动词-ing形式。如： When it comes to educating the kids, he kept silent.当谈及到教育孩子时，他一言不发。

　　1. — When _____ and visit our exhibition next month?

　　—When _____, I’ll let you know.

　　A. will he come; he will come

　　B. will he come; he comes

　　C. does he come; he will come

　　D. does he come; he comes

　　2. It was an exciting moment for these Spanish football fans this year, _____ for the first time in years their team won the World Cup championship.

　　A. which

　　B. that

　　C. while

　　D. when

　　3. When _____ with difficulties, she ran away.

　　A. faced

　　B. facing

　　C. face

　　D. to face

　　4. — Did you remember the days _____ we worked on the farm?

　　— Certainly. Especially the hard times _____ we spent together.

　　A. which; when

　　B. when; which

　　C. when; when

　　D. which; which

　　5. When I was at college, I _____ three foreign languages, but I _____ all except a few words of each.

　　A. spoke; had forgotten

　　B. spoke; have forgotten

　　C. had spoken; had forgotten

　　D. had spoken; have forgotten

　　6. When _____ the prices of these goods, we must take everything into consideration.

　　A. compared

　　B. having compared

　　C. comparing

　　D. compare

　　7. I shall never forget those years _____ I lived in the countryside with my friends, _____ has a great effect on my life.

　　A. where; which

　　B. when; which

　　C. which; that

　　D. when; that

　　8. It was in 1993 _____ he was at college _____ he joined the Party.

　　A. that; that

　　B. when; when

　　C. that; when

　　D. when; that

　　9. _____ had he arrived home _____ it began to rain.

　　A. Hardly; when

　　B. Not; until

　　C. No sooner; when

　　D. No sooner; before

　　10. _____ there is no gravity, our feet can no longer stay on the ground.

　　A. Since

　　B. When

　　C. While

　　D. As

　　Key：

　　1-5 BDABB

　　6-10 CBDAB