be busy doing sth 为什么是动名词有神马规律吗
be busy doing sth 为什么是动名词有神马规律吗
英语人气:726 ℃时间:2020-03-29 08:05:16
优质解答
动名词就是动词通过变形当名词用,do是动词,doing是do的ing形式,doing 是名词.这类一般是动词加ing.我建议你多做练习,多看字典.
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