南开中学 段胜利
③表示条件： if, unless，so long as, in case(万一)，on condition that, only if，providing/provided that, suppose/supposing that(倘若假使) 等。
例一In time of serious accidents, ___we know some basic things about first aid, we can save lives.
A. whether B. until
C. if D. unless
例二 We won’t keep winning games _____we keep playing well.
A. because B. unless
C. when D. while
例三 Leave your key with a neighbor ___ you lock yourself out one day
A. ever since B. even if
C. soon after D. in case
例四 —— What are you going to do this afternoon?
—— I’ll probably go for a walk later on it stays fine.
A.as far as B.so long as
C.even if D.as if
例五 John's mother allowed him to go swimming ___that he didn't go too far from the bank.
A. if B. unless
C. when D. on condition
答案：CBDBD
④表示让步： though, although, even if，even though，as(让步倒装)，while ( 一般用在句首 ), in spite of the fact that, no matter …，whatever, whoever, wherever, whenever, however, whichever等。
例一 We had to wait half an hour ______ we had already booked a table.
A. since B. although
C. until D. before
例二Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.
A. as if B. now that
C. even though D. so that
例三 We won’t give up we should fail 10 times.
A.even if B.since
C.whether D.unti1
例四Your uncle seems to be a good driver ; ______ ,I wouldn’t dare to travel in his car .
A.even so B.even though
C.therefore D.so
例五 ______ happens, we should never lose hope.
A.No matter what
B.no matter whatever
C.What
D.All what
例六 You should try to get a good night’s sleep much work you have to do .
A.however B.no matter
C.although D.whatever
例七He tried his best to solve the problem, _______difficult it was.
A. however B. no matter
C. whatever D although
答案：BCAAAAA
⑤表示方式：as, as if, as though, the way，how等。
例一 It looked ___ it was going to snow.
A. as if B. if
C. as D. whether
例二 We must do the experiment ______the teacher does.
A. whatever B. as
C. how D. when
答案：AB
⑥表示目的： that，so that, in order that, in case that, lest, for fear that，in case, for fear that，in the hope that, for the purpose that, on purpose that等。
例一 Roses need special care _____ they can live through winter.
A. because B. so that
