解析:what引导表语从句,在从句中作介词for的宾语。句意:船停泊在港口里是安全的,但那可不是造船的目的。 4.(2015·浙江,6改编)If you swim in a river or lake,be sure to investigate __what__ is below the water surface. Often there are rocks or branches hidde...
(That + 一个完整的句子可做主语)。比如说:(That education is important) is clear.这就是主语从句的基本形式。但如果句子要是这样,主语过长。所以,我们习惯于用it来代替原来的主语。而把原来的主语放在句子的最后。这句话可改为:It is clear that education is impo...
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