hashtable1. 固定结构
a. Last night I was about to go to bed when the phone rang.
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b. No sooner had I arrived home
_____ it began to rain.
A. when
B. while
C. as
D. than
a. be about to do sth…when
b. be on the way to doing sth…when
c. be on the point of doing sth when
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2. 连接两个过去动作，一个长动作，一个短动作。
②I was cooking in the kitchen when someone knocked at the door.
3. 用作从属连词，意为“既然，尽管”，表示让步。例如：
①Why u metal when you can u plastic?既然能用塑料，为什么用金属?
②They kept trying when they knew
it was hopeless. 尽管他们知道那件事没有希望，可是他们还在不断地努力。
4. since when常引导非限制性定语从句，when意为which time。
since when从句应用完成时态。
a.I came here in 1949, since when I have been engaged in this work.
b.We came back on Tuesday, since when we have been working in the repair shop.
1. On a rainy day I was driving north through Bermont __________ I noticed a young man holding up a sign reading “Boston”.
A. which
B. where
C. when
D. that
2. Why do you want a new job _____ you've got such a good one already?
A. that
B. where
C. which
D. when
flightless bird3. Why do some governments spend billions of dollars on space exploration _______ the people of the countries are still suffering from starvation and poverty?
A. whether
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B. though
C. unless
D. when
4. We are living in an age _______ many things are done on computer.
A. which
B. that
C. where
D. when
5. The reporter said that the UFO ______ east to west when he saw it.
top modelA. was travelling
B. travelled
C. had been travelling打开收音机
D. was to travel罪恶之城 人人影视
6. ______ got into the room
_________ the telephone rang.
A. He hardly had; then
B. Hardly had he; when
英文绕口令C. He had not; than
D. Not had he; when
7. ---- Can I join your club, Dad?
---- You can when you _______ a bit older.
A. get
B. will got
C. are getting
D. will have got
8. I shall never forget tho days
________ I lived in the countryside with the farmers, ________ had a great effect on my life.
A. that; which
B. when; which改英文名
