(1) Suppose/ Supposing ---, 假如……
例：Suppose/Supposing he is absent, what shall we do?
假如他缺席，我们怎么办?
(2) On condition that只要……;如果……
例：I'll come on condition that John is invited, too.
如果约翰也被邀请，我就来。
(3) provided (that)/ providing ----- 只要……
I will come provided (that) I am well enough. 只要我身体好，我一定来。
You may go out providing you do your homework first.
只要你先做作业，你便可以外出。
(4) so/as long as
例：As/So long as you work hard, you'll succeed in the end.
只要你好好干，终究会成功的。
(5) 祈使句+and + 陈述句(表肯定)
例：Give him an inch and he’ll take a mile.
(= If you give him an inch, he’ll take a mile. ) 他会得寸进尺的。
(6) 祈使句+ or/otherwise +陈述句 (表否定)
例：Start at once, or / otherwise you’ll miss the train.
(= If you don’t start at once …)
(= Unless you start at once, you’ll miss the train.)
立即动身，否则你会错过那班火车的。
(7) …won't...unless... 除非……否则我不会…….
例句：I won't write to him unless he writes to me first. 我不会写信给他的,除非他先写给我