be doing 的用法和be的用法有一句话：The average dad has gradually been getting better about picking himself up off the sofa and pitching in.我的问题是：这里用了现在完成时,has+过去分词的形式.1、但为什么不是：..

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be doing和doing的用法区别 有be afraid doing的用法吗? there be ...doing 的用法 be doing结构的用法 be doing和be going to的区别和用法!be doing和be going to的区别和用法 be busy in 的用法?它和be busy doing, be busy with有什么区别? be to do和be doing在表将来的时候用法有什么区别? sure的用法be sure of doing和 be sure to do有什么区别呀? amaze的用法be amazed to do和be amazed doing有区别吗? be always doing 的含义和用法如题 up to sth 的用法和be busy doing有什么区别吗如题. be doing be is going to will用法的区别 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, being done 和 be doing ;done ；doing ; be done ;to be done 的用法 请详细点 谢谢 关于scare的用法问题be scared of doing和be scared to do有什么区别呢, be used to do和be used to doing的用法和区别 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,