It is no use doing sth.做某事是毫无用处的

　　It is not unusual for sb to do...某人做……不足为奇

　　It is possible (impossible) to是(不)可能的

　　It is dangerous to危险

　　It is (rather) common to do...(相当)普遍

　　It is reported that...据说;据报导

　　lt is required that要求…

　　It is said that据说…

　　It is thought that...人们认为…

　　It is (not) true that(不)是真的.

　　It is (very) difficult to(非常)困难.

　　Ifs really a challenge for me to对我来说确实是一个挑战

　　It is (very) useful to很有用

　　It is (was) obvious (clear) that...很明显…

　　It seems (seemed) that...好像…….似乎…

　　It sounds like听起来好像…

　　It takes sb some time (money) to do sth.某人花多长时间/多少钱做某事

　　It wasn't until that...直到……才

　　It would be wonderful if...如果……那就太好了

　　It's not (just) like sb to do sth...的行为不/正像某人的一贯作风

　　lt's a bad habit to是一个坏习惯

　　It's a great pleasure to(感到)非常愉快

　　It's customary to...是习惯

　　It's delightful to令人很高兴

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