他如此偉大，我們無論怎樣贊揚他都不過分。

　　66.The development of society has made it necessary for us to have a good knowledge of English,so we can't overemphasize the importance of learning English.

　　社會的發展使我們有必要精通英語，因此學習英語的重要性無論怎么強調都不過分。

　　67.Since it's a good thing ,we can't do it too soon.

　　既然是好事，越早開始做越好。

　　不定式作主語，it做形式主語

　　It +系動詞(be,seem…)+adj./n.+(for sb.)+to do sth.

　　68.It is important for us to have a good knowledge of English.

　　精通英語很重要。

　　69.It's our duty to help others .

　　幫助別人是我們的義務。

　　70.It's a pleasure (for us )to go picnicking in such pleasant weather.

　　71.It's normal for the professional workers these days to prefer to live in the countryside.

　　72.It's a pity for there to be any disagreement in the family.

　　注意：要表示不定式動作的執行者，必須用for sb