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it's a waste of time 后面是该加to do sth 还是doing sth?
全部waste time doing sth a waste of time doing sth 是固定搭配词组,在waste用法里面有描述 eg.Don't waste time quarrelling with him(不要浪费时间和他争辩) It's a waste of time quarrelling with him(和他争辩是浪费时间)to do sth 语法上就是这么用的,或者说...
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with后加什么从句（通用8篇）
篇5：so后面加什么从句There are so many different makes to choose from.有很多不同的型号可供选择。There are only so many hours in a day.一天不过这么几个小时。
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help后面是跟do to do还是跟doing
一般情况下，help后面是跟不带to的不定式，即help do sth.帮助做某事不过to 也可以不省略，也可以help to do sth.帮助做某事。 help sb. with sth. 帮助某人做某事 比如，I often help my little sister with her English.我经常帮助我妹妹学习英语 can't help doing sth. 禁不住做某事 比如，Marry can't help cry
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be believed to do还是doing
to do后面表示的是将来时态，代表某人被认为将要做某事。to be doing 表示的是现在时态，代表某人被认为目前正在做某事。如：Lucy is believed to go to London.Lucy被认为 将要去伦敦。（没去...
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had to 后面接什么时态语法解释
had to后面接的时态 had to：不得不 had to是一般过去时态 后加动词原形,had to do sth.意为不得不做某事，必须做某事 had to 与 must have been的区别 had to强调不得不,有被迫的意思,must ...
with后面可以加to do
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