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1、以单数名词或代词、动词不定式短语、动名词短语或从句作主语时，谓语动词一般用单数形式；主语为复数时，谓语动词用复数形式。
⑴ His father is working on the farm. ⑵ To study English well is not easy. ⑶ What he said is very important for us all. ⑷ The children were in the classroom two hours ago. ⑸Reading in the sun is bad for your eyes.
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