英语句子什么情况下加ing-英语句子中什么时候用ing形式-英语句子中什么时候加
1动名词。例：Swimming is good for health. 2现在进行时。例：I am doing my homework. 3动词并列。例：She stood here, reading a book. 4动词前有部分介词。例：She is looking forward to seeing him. 5有些动词加i...
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1动名词。例：Swimming is good for health. 2现在进行时。例：I am doing my homework. 3动词并列。例：She stood here, reading a book. 4动词前有部分介词。例：She is looking forward to seeing him. 5有些动词加i...