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        1It is + ~/~/^ȥ~ + that ľ () = that ľ () is +~/~/^ȥ~

        It is well known that + (֪)

        It is obvious that + (@)

        It is apparent that + (@Ȼ)

        䣺It is well known that diamonds are the hardest substance.

        䣺It is universally acknowledged that trees are indispensable to us

        ȫ綼֪ľ҂Dzɻȱ.

        䣺It is common knowledge that honesty is the best policy.

        2. It is + ~/^ȥ~/~ (for sb.)+ to do …

        䣺 It is hard (for me)to finish the work in three days.

        It is an honor to meet you.

        3.It was said/reported/ thought/believed + thatľ() f//J…

        Sb. was said/reported/ thought to do …

        䣺It was said that he had been killed in the accident.

        ˾ӿD飺He was said to have been killed in the accident.

        4. It took/ will take sb. + time to do … ij˻Mrg…

        䣺It took me 10 days to finish my paper.

        It ʾrgijþ

        1.It is/has been+һΕrg+since... "ԏ...ж"

        sinceďľһ^ȥr

        It has been two weeks since he left

        ѽx_˃ɂ

        2.It was+һΕrg+before... "...֮ǰ^˶Lrg"

        before ďľ^ȥɕr

        It was three years before he had finished his research

        о֮ǰѽ^ȥ

        3.It will be+һΕrg+before... "^˶ò..."

        beforeďľһFڕr

        It will be two days before she arrives at Britain

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