It's_____that he will come tomorrow.A.sure B.sure of C.certa

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It's_____that he will come tomorrow.A.sure B.sure of C.certain D.certain about
请讲一讲四个选项的区别，

C 固定的搭配,it is certain that...很肯定……
sure一般只以人做主语,如I am sure about sth/ I am sure that...
而certain其实是人或物做主语都行,it做主语只能用certain
再问：有没有sure of 、 certain about这两种用法？
再答：可以的，of跟about这里是可以互换的，但这里是因为主语it只能用certain，而且后面是从句

It's_____that he will come tomorrow.A.sure B.sure of C.certa Tom,____to come tomorrow A.is sure B.makes sure C.be sure D. He will come .I‘m not sure.A.may B.maybe C.may be D.possible He will come tomorrow.I am sure 合成一句 I'm sure that he will come back tomorrow中的that he will come改 My mother is sure of that he will come. Can you make sure ____?A.that he will come here today B.when I'm ___ my friend will come.He called me yesterday.A sure B I'm sure he will come tomorrow.的同义句：He is____ ____ ____tomor I'm sure he will come tomorrow.(同义句）He is ______ ______ ____ OK .I am sure he will come I'm not sure--------he will come tomorrow.中间为什么不能用whether来连接