??????2017??????????:????????

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?????????2015??????????????????????????

??????1. ????

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??????? ????????????since, once, while, as, before, after, until, suppose, however, in case ??

????????????????the moment, the instant, the minute, the first time, each time, every time, immediately??

?????????????????????????????????????when, before, unless, as long as, however??

??1. ??????

??????

1.?if?unless?if only?once?so/as long as?supposing(that)(??)?in case?so/as far as?on condition that?provided/providing that???

I won�t go unless I�m invited.?????????????

2.�???+and/or/or else/otherwise+???�?????????????????????? Use your head, and you�ll find a way.????????????

3.????????????????????? ???????????, ??????????

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1.though?although???????????????????????????????????but???????yet?still?nevertheless???though??????????????�??�???? Although the TV set is very dear?I still want to buy it.

?????????????????

2.as????????????????????????

????/??/??+as+??+?????????????????????

Child as he is, he knows a lot.??????????????

???+as+??+????

Try as I might, I couldn�t lift the stone.

??????????????????

3.even if/though??????

We�ll make a trip even if/though the weather is bad.

???????????????

4.�whether�or��??????????

Whether you believe it or not, it is true.????????????

5.�no matter+wh-�?????????

?????????�?????-ever�???�no matter+?????�?

No matter what happened, he would not mind.

???????????????

??3. ??????

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1.when, while, as??????????

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as

?? ??�?��???�????when/while????1

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?at or during the time that????????????

when ???????????????????????

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while ??????????????????????

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when??????????????

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?while??????????????????????????�????�?

?when????????????�???? / ??�????and at this/that time/moment?????? be (just) about to do�when�???��??��

be (just) on the point of doing�when�???��??��

be going to do�when�????��??��

be doing�when�???��??��

had (just) done�when�???��??��

2.before??????????

?before?????????????????

??�It be+???+before??�?????????���(??)?�??????���?�?????????????????????????????????

It will be many years before the chemicals start to escape from the containers.??????????????????

It was not long before he came back.????????

?before???�????�?

He had measured me before I could get a word.

???????????????????

?before???�????�?

I�ll write it down before I forget.

???????????????

3.since?????????

??�??��??�??????????????It is/has been+????+since�(?????????) It was+????+since�???????????

Mr. Li has been here since he came back.

??????????????????

???since?????????????????????????????????????????????????????????????

4.??�?��?���????

(1) as soon as/once

(2) on doing sth./on one�s+n.?????

(3) no sooner�than, hardly/scarcely�when

(4) the moment,the instant,the minute,the second

(5) instantly, immediately, directly

5.until?till?????????

(1) �?????????+until�??�?????��??�????�??��??�?

I waited for him until he came back.?????????

2

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???????2017??????????:????????????????
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