单词 “if” 可能是许多英语学习者在学习条件句时接触到的最基本的引导词之一。在表示一件事情发生的条件时，除了用 “if” 以外，还有其它可以使用的词语或固定搭配。比如，下列说法都可以用来谈论导致一件事情发生的具体前提：as long as 只要；provided/providing (that) 如果、只要；on condition that 条件是、在……的条件下。做八道习题，考考你是否能灵活地运用除 “if” 以外，用来表示条件的短语和单词。

1. But _______ the money transfer isn’t successful?

a) unless

b) even if

c) in case

d) what if

2. We can give you a refund for the jeans _______ you provide the receipt.

a) supposed

b) on the condition that

c) unless

d) in case

3. The PC will be safe from malware attacks _______ good anti-virus software has been installed.

a) provided that

b) unless

c) in case

d) should

4. _______ they offered you the job, would you take it?

a) But for

b) In case

c) Suppose

d) Should

5. _______ they deliver the sofa on Tuesday, there’ll be no one home to receive it.

a) In case

b) Providing that

c) But for

d) Even if

6. They would have caught a serious virus, _______ the vaccination they had had before they left.

a) but for

b) providing that

c) on the condition that

d) so long as

7. The city mayor said she didn’t mind street art in the city _______ it wasn’t offensive.

a) unless

b) whether

c) in case

d) so long as

8. There were ambulances on standby _______ the students fell sick at the exam hall.

a) unless

b) so long as

c) in case

d) but for

答案

1) d, 2) b, 3) a, 4) c, 5) d, 6) a, 7) d, 8) c.