BE BUSY IN DOING 的例句

BE BUSY IN DOING 的例句 be busy doing 和 be busy in doing 的区别? be busy doing sth 例句 be busy in 的用法?它和be busy doing, be busy with有什么区别? busy的用法be busy with后面加什么词be busy in doing与be busy with doing与be busy doing有什么区别 be busy in doing sth be busy doing中,有in么? 1.be busy(in )doing 2.be busy to do 3.be busy with 4.be busy for区别? be busy doing sth 与be busily doing的区别 be busy doing中doing什么成分那个句子能说明呢？给个例句 be busy doing造句 类似be busy doing ,enjoy doing 的初中英语语法 be useful to do sth 与be useful in doing sth的区别最好带有例句. 有没有be busy in doing sth.（忘了-_- be+busy+doing=be+( )+( be succeed in的用法是be succeed in还是succeed in?后面加doing还是sth?最好有例句 be busy doing 是不是省略了in 应该是 be busy in doing 还有 上面两个跟be busy with 有什么区别么 be busy with doing 和be busy in doing 在用法上有何区别如题