英语句子的构成开头什么时候用动名词什么时候用不定代词加动词什么时候用动词原型，
\u82f1\u8bed\u53e5\u5b50\u5f00\u5934\u7684\u52a8\u8bcd\uff0c\u4ec0\u4e48\u65f6\u5019\u7528\u4e0d\u5b9a\u5f0f\uff0c\u4ec0\u4e48\u65f6\u5019\u7528\u52a8\u540d\u8bcd\uff0c\u4ec0\u4e48\u65f6\u5019\u7528\u52a8\u8bcd\u539f\u5f62\u4e00\u822c\u6765\u8bf4\uff0c\u5f53\u4f60\u60f3\u8868\u793a\u67d0\u79cd\u76ee\u7684\u65f6\uff0c\u5f00\u5934\u5c31\u7528\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\uff1b
\u5f53\u4f60\u4ec5\u4ec5\u662f\u60f3\u7701\u7565\u5f00\u5934\u7684\u4e3b\u8bed\u65f6\uff0c\u90a3\u4e48\u5f00\u5934\u7684\u52a8\u8bcd\u5c31\u8981\u7528\u52a8\u540d\u8bcd\uff0c\u539f\u56e0\u5f88\u7b80\u5355\uff1b
\u5f53\u4f60\u60f3\u8868\u793a\u7948\u4f7f\u53e5\u8bed\u6c14\u65f6\uff08\u6bd4\u5982\u547d\u4ee4\u3001\u65a5\u8d23\u3001\u54c0\u6c42\u7b49\uff09\uff0c\u5c31\u7528\u539f\u5f62\u3002
\u5982\u679c\u662f\u7948\u4f7f\u53e5\uff0c\u7528\u52a8\u8bcd\u539f\u5f62\u3002
\u4f8b\u5982\uff1a
Come here please.
\u5982\u679c\u4f5c\u4e3b\u8bed\uff0c\u7528\u52a8\u540d\u8bcd\u3002
\u4f8b\u5982\uff1a
Swimming is very interesting.
比如，你要说祈使句：Come to my home！来我家吧！祈使句就用动词原形开头！
动名词开头： Helping others is good！帮助他人是好的！这里的动名词做了句子主语。
也可以说To help others is good！也可以用动词不定式做主语。表达的意思跟上文一样的！😊
谢谢采纳！☺
祈使句用动词原型
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