be busy doing sth 为什么是动名词有神马规律吗

be busy doing sth 例句 be busy in doing sth be busy with sth 与be busy doing sth 英语 翻译 be busy doing sth 有没有be busy with doing sth? 用be busy doing sth.句型造句 BE BUSY DOING STH 是主系表结构吗 be busy doing sth 与be busily doing的区别 be busy doing sth/with sthbe busy doing sth 后跟动词be busy with sth 后跟名词麻烦谁能造个句子 be busy doing sth 为什么是动名词有神马规律吗 be busy doing sth和be busy with sth这两个句式的意思和用法 he is always busy___ (work)是用be busy doing sth还是 be busy with sth 是be busy doing sth还是be busy to do sth? be busy with sth 与be busy doing sth的区别 be busy doing sth 和be busy to do sth 的区别 be busy with sth.be busy doing sth.这两句怎么解释?两句意思是否一样? be busy doing sth和be busy with sth这两个句式的意思和用法, be busy doing sth和be busy with sth用法详细讲解