be busy for的意思和用法

be busy for的意思和用法 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这两个句式的意思和用法, be busy with 和 be busy doing sth 意思和用法有什么区别?知道的帮忙讲下, be busy in 的用法?它和be busy doing, be busy with有什么区别? be busy with和be busy for的区别 strict和busy的用法 busy的词性和用法 be busy in 用法 busy with和busy for和busy to的区别 be busy (in) doing something 与be busy with something的用法重点是它们各自的用法和各自强调的是什么? be busy with与be busy in二者的意思都是忙于（做）什么事情,那么它们在具体用法及意思上有什么区别? 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 英语中be,do,for,to,with,the,的用法和意思是什么? be busy doing sth和be busy with sth用法详细讲解 up to sth 的用法和be busy doing有什么区别吗如题. be busy doing 和 be busy in doing 的区别? be used to do 和be used for的用法