什么是PRESENT PERFECT CONTINUOUS啊?

什么是PRESENT PERFECT CONTINUOUS啊? present perfect present perfect simple and present perfect continuous Present simple,present continuous,present perfect simple,present perfect continuous present perfect continous是什么 present perfect是什么意思 The present perfect tense write the sentence in the present perfect 用present perfect tense ,simple past tense , 求 4 个 present perfect progressive 句子 求 4 个 present perfect progressive 句子.. the present perfect tense的中文 什么是Perfect Market theory present perfect continuous和present perfect simple的区别与用法 A table is made of wood and it is brown and square and it is used to put things on.请问这句话是什么时态?A.simple past (active) B.simple present (passive) C.present perfect D.simple present (active) 什么时候该用 present perfect 什么时候该用past simple? 求 past | past perfect | present perfact 的分别RT present perfect progressive 现在完成进行 和present perfect 有什么区别present perfect 加has/have+past participle 而present perfect progressive has/have+been+verb+ingparticiple 过去分词