has been playing是什么时态?是完成时吗?为什么后面要用ing啊?明天我要讲这个

has been playing是什么时态?是完成时吗?为什么后面要用ing啊?明天我要讲这个 have/has been+done 是什么时? 紧急 The little boy is dirt from head to foot because he _____ in the mud all morning.A.has played B.is playing C.has been playing D.was playing 是用过去完成时 还是现在完成进行时 英语中have been；has been是什么? He __tennis every day since he__sixteen A has played...is B played...hasbeen Cwas playing..hasbeenD has been playing...was has been done 和has been 区别是什么 I know this has been hard.has been 是什么语法? Mary has been playing the guitar for two hours.(改为一般疑问句) ---- Mary ----- playing the guitaMary has been playing the guitar for two hours.(改为一般疑问句)---- Mary ----- playing the guita for two hours? Though learning gymnastic has been more difficult 这里的has been 是什么用法不是只有 have been dong 和has been done吗?这里的has been 是什么? She has been playing basketball (since she was seven )（对括号内提问） she has been playing basketball for 2hours (改为同义句） she has been playing tennis for-------【填空】她已打网球三年半了英语怎么说 将he has been playing comquter games for two hours改为同义句 He's been playing golf for ten years..He 后面是 has he has been playing the piano for a long time(改为一般疑问句) Lisa has been playing the violin for two years 改为否定句 There has never been a question of us playing for a different have/has/had加been是什么时态