be busy with sth.spend on sth.be busy doing sth.spend doing sth.keep on dong sth mind doing sth这一些总称什么,这些东西是规定的吗?介词也是吗?如果是规定的有规律吗?难道要死记

be busy with sth be busy with sth be busy with sth 与be busy doing sth be busy with sth 和 be busy dong 有没有be busy with doing sth? be busy with sth的中文 be busy with sth.什么意思 be busy with sth.的应用 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 be busy with sth 与be busy doing 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 be busy with sth 与be busy to do sth的区别 be busy with sth 与be busy doing sth的区别 ,可以互换吗 1.be busy doing sth 2.be busy with sth分别造个句,