一个句子中必须有且只有一个谓语动词或系动词(不含助动词do、情态动词),若再出现谓语动词或be动词,则需改为非谓语动词。
let sb. do sth. make sb. do sth. (让某人做某事)
help sb. do sth.=help sb. with sth.(帮助某人做某事)
you had(=you’d) better(not)do sth.(你最好(不)要做某事)
情态动词+do sth.
shall we do sth. why not do sth. why don’t you do sth. 提建议
order/ask/tell sb. (not) to do sth.(让某人(不)做某事)
ask for sth.(要求某物)/ask sb. for sth.(向某人要求某物)
would like to do sth.(愿意做某事) decide to do sth.(决定做某事)
want to do sth.(想做某事) plan to do sth.(计划做某事) used to do sth.(过去常做某事)
It’s time to do sth.=It’s time for sth.=It’s the…time (是做某事的时间)
I have something good to eat. It is +adj.+for/of sb. to do sth.(adj.形容事物用for,形容人用of)
try to do sth.(努力做某事) try one’s best to do sth.(尽某人最大努力做某事)
疑问词+to do(用于宾语从句)
I don’t know what to do.
I don’t know how to do it.(注意要加it,因为how不能作do的对象)
I don’t know where to go.
enjoy doing (喜爱做某事) be+doing(正在做某事)
go+doing (去做某事) do some+doing
介词+doing(除to do) be busy doing (忙于做某事)
finish doing(完成做某事) keep doing(保持做某事) practise doing (练习做某事)
feel like doing (想要做某事) give up doing(放弃做某事) mind doing(介意做某事)
what about doing how about doing (做...怎么样?提建议)
like doing(习惯性)/to do(一次性)
stop/go on(继续) doing(正在做的事)/to do(去做另一件事)
remember/forget doing(做过)/to do(未做)
see/hear sb. doing(正在做)/do(做过或经常做)
start/begin doing/to do(不作区分,题目中有哪种形式用哪种形式)
can’t help doing(禁不住做)/to do(不能帮助做)
need doing(被动)/to do(主动)
I need to go/This car needs repairing.
make/find/leave/keep +sb./sth.+adj.(状态)
I keep the window closed./open.(我保持窗户关闭/打开的)
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