五、It 用作形式宾语

     用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。
       It 作形式宾语的常见句型：
       1. verb+ it+ adj./noun (for/of) to do/clause  (verb=think, believe, suppose, consider, feel, make, keep…)
       例  I think it hard for you to do the task on your own./I think it hard that you'll do the task on your own.
       2. verb+it+adj./noun (one's) doing (adj.=useless/worth/worthwhile)(noun=no use/no good/worth one's while/a waste of time/money/energy/words) (verb=think, believe, suppose, consider, feel, make, keep…)
       例  I'll make it worth your while telling me about his secret.
       3. verb+it+ important/unimportant/necessary/unnecessary/natural/essential that … (should)…
       verb+it+of much/great/no/little importance that…(should)…
       (verb=think, believe, suppose, consider, feel, make, keep…)
       例  I think it important that you (should) attendthe conference.
       4. verb + it+ as+ noun/adj.+ clause (verb=accept, regard, take, see, view)
       例  The lecturer takes it as encouraging when so many students attend his lecture.
       5. v. +it + prep. + that…
       owe it to sb. that…把…归功于…
       leave it to sb that…把…留给某人去做
       take it for granted that …想当然
       keep it in mind that…
       例  Don't bother to arrange anything. Just leave it to me to sort out.
       6. It用在不能直接跟宾语从句的动词后面，尤其是表示好恶的动词后，enjoy, like, love, dislike, resent, hate, don't mind, be fond of, feel like, see to  宾语从句紧跟it之后
       例  I hate it  you can swim so well and I can't.
       7. It用在不能直接跟宾语从句的介词后面，宾语从句紧跟it之后（except that例外）
       例  I'm for it that you will follow their advice.

六、It 常用的固定搭配

       1. make it
        (1). 在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达
       例  It's hard to make it to the top in show business.
        (2). 在口语中相当于fix the date for,表示“约定好时间”
       例  —Shall we meet next week?  —OK. We just make it next Saturday.
       2. as it is
       (1). 相当于in fact, in reality表示“事实上，实际情况是……”
       例  We had planed to finish the task today, but as it is we probably won't finish it until next week.
       (2). 相当于方式状语从句，表示“照原样”
       例  Leave the table as it is.
       3. as it were  相当于as one might say, that is to say, 表示“也就是说，可以说，换句话说”
       例  He is, as it were, a modern Sherlock Holmes.
       4. if it weren't for…/if it hadn't been for…用来引导虚拟语气，相当于without, or but for, 表示“如果不是……，要不是……”
       例  If it weren't for Tom, I wouldn't be alive today.