= That
he’s round and tall like a tree is very clear.
⑵It is important ( necessary， right， strange， natural...) that 从句
常译为┅是重要的(必要的,对的,奇怪的,自然的┅).that 后的从句中要用虚拟语气(should + 动词原形)，should 可以省去，建议记住该句型中的形容词。
①It is important that we
(should) learn English well.
②It is necessary that he
(should) remember these words.
⑶It is said (reported/
learned/believed/thought/known/told/hoped.....) that 从句 常译为＂据说(据报道，据悉．．．)＂。
①It is said that he has come to
Beijing.
②It is reported that another
earth satellite has been put into orbit.
⑷It is suggested ( advised/
ordered / demanded/ insisted/ commanded... ) that 从句.that 后的从句要用虚拟语气(should + 动词原形)，should 可以省；常译为＂据建议；有命令．．．)
①It is suggested that the
meeting ( should ) be put off.
②It was ordered that we ( should
) arrive there in two hours.
⑸It is time ( about time ，high time ) that从句(虚拟语气:动词用过去时did)
① It is time that children went to bed.
② It is time you bought a new car.
③ It is (high ) time you made up your mind.
⑹It is the first ( second ... )
time that从句(从句用现在完成时 have done )
It was the first (
second ... ) time that从句(从句用过去完成时had done )
常译为＂是第一(二)．．．次．．．＂。
It is the first time I have been here. = This is
the first time I have been here
⑺It is a pity ( a shame /an honour/a good thing/a
fact,/a surprise/... ) that从句.
that后的从句一般用虚拟语气(should + 动词原形)，should可省去．表示出乎意料，常译为＂竟然＂。没有这种意义时，则不用虚拟语气。
①It is a pity that such a thing ( should ) happen
in your class. 这种事竟然发生在你们班 上，真是遗憾！
②It is a pity that he is ill. 他生病了，真遗憾！
⑻It happens (seems， looks， appears ) that从句.常译为 “ 碰巧…,似乎是…,看起来…”
①It happened ( so happened )
that he met his teacher in the street. 碰巧．．.
②It seems that he
will be back in a few days. 看来．．．
2.作形式主语替代不定式
. ⑴ It is
kind ( of sb. ) to do sth. 不定式的逻辑主语是由 of引起，主句中的形容词必须是能表示逻辑主语特征的褒义或贬义形容词。
常见的词有：
bad ， brave ， careless， clever ， cruel ， foolish ， good (好心的)， honest ， horrible ， kind ， lazy ， modest ， naughty ， nice(有教养的)， polite， rude ， silly ， stupid ， wise ， wrong(错误的)等。
这个句型可以改写为：sb. is kind to do sth. 。
如:It is kind
of you to say so. = You are kind to say so.
⑵It is necessary ( for sb. ) to
do sth. .不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的中性形容词。 常见的形容词有：
important， necessary， natural easy ， safe ， common ， normal ， hard ， difficult ， dangerous ， unusual， rare ， impossible ， pleasant
如:It is
important for her to come to the party. = It is important that she (should )
come to the party.
⑶It takes sb.
... to do sth. 常译为＂做．．．要花费某人．．．＂。
如:It took
thousands of people many years to build the Great Wall.