大學(xué)英語(yǔ)四級(jí)考試涉及的語(yǔ)法知識(shí)點(diǎn)多、涉及面寬，對(duì)不少考生來(lái)說(shuō)都是一個(gè)難題。希望通過(guò)本專題的學(xué)習(xí)，考生能對(duì)四級(jí)語(yǔ)法有更全面的掌握！

6. 條件狀語(yǔ)從句：

連接詞：if, once, as long as, on condition that

① 如果引導(dǎo)的條件可以實(shí)現(xiàn)，主將從現(xiàn)；

② 如果引導(dǎo)的條件和事實(shí)相反，則用虛擬語(yǔ)氣；

eg：If winter comes can spring be far behind.

As long as it doesn't rain, we can play.

You can go out on condition that you wear an overcoat.

Modern cars are far tougher to steal, as their engine management computer won't allow them to start unless they receive a unique ID code beamed out by the ignition (點(diǎn)火) key.

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