初中·課本中不會教你的 539　It is +形容詞／名詞+for sb.+to do sth.

539　It is +形容詞／名詞+for sb.+to do sth.

　動詞不定式用作主語時，常用it 作形式主語，放在句首，而把真正主語不定式移到句尾，這就是It is +形容詞／名詞+(for sb.) +to do sth. 結構的來源。如果點明不定式動作的執(zhí)行者，即不定式的邏輯主語，就在不定式前加上for sb., 表示“對……來說”。參見本書有關部分。

It is easy for me to read the book. 對我來說，讀這本書很容易。

It is important for us to learn English well. 對我們來說，學好英語是重要的。

Is it necessary for us to leave so early? 我們這么早動身有必要嗎？

It is really hard for Jim to pass the entrance examination. 對吉姆來說通過入學考試真的很難。

It is possible for Tom to finish the work before Friday. 湯姆有可能在星期五前完成這項工作。

It is a good idea for us to travel to the north. 去北方旅行對我們來說是個好主意。

It is easy to climb up the ladder. 爬上那個梯子很容易 。

It is not hard to climb up the ladder.

to climb up the ladder is easy.

It is hard to do the job. 這項工作很難做 。

It is not easy to do the job.

to do the job is hard.