21. Butfor + n. / pron., sb. / sth. would (not) have done..要不是.,某人早就(表示虚拟语气)=If it had not been for..,./If there had not been ..
22. Itwon(t) be long before +从句(从句中用一般现在时)不久/很久就要.
It was (not) long before+从句(从句中用一般过去时)不久/很久才..
23. Thosewho.(从句及主句中谓语动词用复数形式).
Anyone who= Whoever..(从句及主句中谓语动词用单数形式)
24.主句(一般现在时或过去时)...when从句.(might/ should do 或might / should have done) 表示对比,意思为 本该(可)而却,主句中为陈述语气,从句里为虚拟语气
Eg: Whyare you here when you should be in school?你本该上学的怎么在这儿?
Hestopped trying when he might have succeeded .本该已成功了他却停止努力了.
25. Thereis ./ Sb. have no doubt that(同位语从句,that不可省略) 毫无疑问
There is / Sb. have some doubt whether..(同位语从句不可用if)不确定是否
Sb. doubtif / whether. 某人怀疑是否
Sb. dont doubt that 某人不怀疑
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