在工作或学习中，大家常会用到英语否定疑问句，那样什么是不是定疑问句？该怎么用呢？
下面一块儿学习下名词性从句的使用方法及概念吧：
1.It’s the first time that……….
It was for the first time that………
It’s time that……..
2.It’s the same with sb. / So it is with sb.
表示某人也这样
3. …be about to do / be doing……when…….正要做/正在做……就在那时…….
4.A is twice / three times as +原级+as B A是B的两倍/三倍
A is twice / three times the n. of B. A的…是B的两倍/三倍
A is twice / three times +比较级+than B A比B多两倍/三倍
5.It’s a waste of time / money doing / to do…做……费时/资金
It’s no use / good doing……… 做……是没用的
It’s possible / probable / likely that………. 非常可能……
It makes great / no sense to do……做某事非常有/没意义
6.There’s no use / good doing……. 做……没用
There’s no sense / point doing…… 做……没意义
There is no need for sth. / to do……. 没过必要做……
There is possibility that…………非常可能/没可能……
7.The+比较级……..,the+比较级………越…….., 越…….
注意：前半句为从句，用一般目前年代替以后时;
8.It seems / appears that sb…….在某人看来某人……
= / appears to be / to do / to be doing / to have done……..
It seems / looks as if……….好象/好像……..
9.It happened that sb. ……..某人碰巧……..
= Sb. happened to be / to do / to be doing /to have done…..
10.It is said / thought / believed / hoped / supposed …….that sb………
=Sb. is said to be / to do / to be doing / to have done……….
11.It is/ has been +一段时间+since从句
Eg:It is two years since he drank.他不喝酒已两年了.
12.…….such…….that…….这样…….以致于
…….such……..as……像……..的这种……
13. Do you mind if I do sth.? / Would you mind if I did sth.? 你在意我做……吗?
14.The chance is that……../ Chances are that……….非常可能…….
15.Check/ Make sure / See to it / See that…….. 确信/务必……..
on it that……..取决于
see to it that…….负责/设法做到…….
注意：除去except / but / in等介词可以直接接that从句，其它介词后需要用it做形式宾语;
17.It is/ was +介词短语/ 从句/ 名词/代词等+that………
How /When / Where / Why is / was it that………..?
注意：此句型为强调句，当被强调的为表示人的词时，还可用who连接;强调主语时，从句后的谓语动词应与前面的主语维持一致;注意与定语从句有什么区别)
好了，以上的语法常识同学们知道得怎么样呢？在平时的生活或学习中尽量地多运用哦。
