C. cause sb. to V
这种句子叫主动宾补结构,就是那个to V是补充说明宾语的,叫宾语补足语。类似的有:allow sb. to V; ask sb. to V; advice sb. to V; enable sb. to V; force sb. to V.
它们全是这种结构和用法。积累多了就明白了。不过,如果谓语动词是感官动词(see, hear, watch等)或使役动词,那个不定式是要省略to的。如:make/have/let/see/hear sb. V: let me see. He often makes me laugh.
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