动词+ it +if从句(例句均出自词典)
当某些及物动词由于语义的因素需要在其后接用if引导的状语从句时，习惯上要在状语从句前加一个it——这类及物动词主要有enjoy, hate, love, like, dislike, appreciate, prefer等。如：
appreciate it if…
I’d appreciate it if you could drop in tonight. 你今晚来一趟我会很感激。
I’ll appreciate it if you will let me know in advance. 如果你事先让我知道的话，我会很感激的。
I would appreciate it if you would keep me informed. 如蒙你随时向我通报情况，将非常感激。
We would appreciate it if you would be so kind as to let us have your cheque by return. 如蒙即送支票，我们将不胜感激。
prefer it if… 希望……；要是……就好了
I’d prefer it if I didn’t have to do so much work. 要是我不必做那么多工作，好就太好了。
I should prefer it if you did not go there alone. 我倒希望你不要一个人去那里。
like [love] enjoy it if… 很高兴……
We enjoy it if you can go with us. 你若能同我们一起去，那我们就高兴了。
hate [dislike] it if… 不高会……；讨厌……
He hates it if people call him Fatty. 他讨厌别人叫他胖子。