How long does it take for a letter to get to America from Be
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How long does it take for a letter to get to America from Beijing?
这里的for是必须的吗?为什么?
那如果是陈述句,用it take 句型的话象下面这样说可以吗?
it takes seven days for a letter to get to America from Beijing.
这里的for也是必须用吗?
这里的for是必须的吗?为什么?
那如果是陈述句,用it take 句型的话象下面这样说可以吗?
it takes seven days for a letter to get to America from Beijing.
这里的for也是必须用吗?
![How long does it take for a letter to get to America from Be](/uploads/image/z/3800839-31-9.jpg?t=How+long+does+it+take+for+a+letter+to+get+to+America+from+Be)
How long does it take for a letter to get to America from Beijing?
it takes seven days for a letter to get to America from Beijing.
两个句子中的it都是形式主语,真正的主语是动词不定式,而动词不定式有自己的逻辑主语(a letter),即构成不定式的复合结构.而不定式的逻辑主语必须靠介词(通常是of /for)来连接.此处for a letter to get to America from Beijing正是不定式的复合结构.
It is very kind of you to say so.
It is very important for us to learn English well.
上两句中的介词都不能省.
it takes seven days for a letter to get to America from Beijing.
两个句子中的it都是形式主语,真正的主语是动词不定式,而动词不定式有自己的逻辑主语(a letter),即构成不定式的复合结构.而不定式的逻辑主语必须靠介词(通常是of /for)来连接.此处for a letter to get to America from Beijing正是不定式的复合结构.
It is very kind of you to say so.
It is very important for us to learn English well.
上两句中的介词都不能省.
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