知识总结:普通专升本英语语法重点之连词！

考点1表示比较的从属连词what/as
例1 Engines are to machines ______ hearts are to animals.(2006年高考山东卷)
A.as B.that C.what D.which
例2_____ I explained on the phone，your request will be considered at the next meeting.
A.When B.After C.As D.Since
例3What a table!I've never seen such a thing before.It is ________ it is long.
A.half not as wide as B.wide not as half as C.not half as wide as D.as wide as not half
【解析】what用作从属连词，表比较，用于A is to B what C is to D结构中；而as表示原级比较，常用于as...as结构中，程度修饰语应置于第一个as之前，嵌入的形容词或副词使用原级?另外as还表“正如?按照”，引导方式连词。
知识总结:普通专升本英语语法重点之连词！
考点2表示条件的从属连词if/unless/as long as/once
例4 ________ I know the money is safe,I shall not worry about it.
A.Even though B.Unless C.As long as D.While
例5Small sailboats can easily turn over in the water ____ they are not managed carefully.
A.though B.before C.until D.if
例6You will be successful in the interview ____ you have confidence.(2007年高考福建卷)
A.before B.once C.until D.though
例7I won't call you，_____ something unexpected happens.(2007年考全国卷)
A.unless B.whether C.because D.while
【解析】表条件的连词if/unless/as long as/unless在用法上存在一些差异。as long as用法同only if/on condition that，强调某事的发生以另一事件的发生为前提；if为正面条件，可能会产生好的或坏的结果，若某种条件产生坏的结果，此时的if可用as long as替换；unless为反面条件，表示除非，如果不，故在真实条件句中常和if…not换用；once既表时间，又包含条件，译作一旦。
考点3表示让步的从属连词although/when/while
例8 We had to wait half an hour _______ we had already booked a table.
A.since B.although C.until D.before
例9______I really don't like art，I find his work impressive.(2007年高考山东卷)
A.As B.Since C.If D.While
【解析】although/when/while均可表示让步，后两者的用法较为特殊。although/though引导让步连词时不与but和yet连用；而while却表示“部分接受，但并非全部”，或用于“强调两种情况?活动等之间的差距”；when也可表示虽然，尽管，同even if，常置于句末。