英语present perfect simple跟past perfect simple 有什么区别?

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 英语present perfect simple跟past perfect simple 有什么区别? 什么是PRESENT PERFECT CONTINUOUS啊? 英语present perfect的句子帮忙写3个短点的谢谢! 请用英语五种句子结构：SV,SVC,SVO,SVOC,SVoO 和八种时态：1 simple present,2 present perfect,3 present progressive,4 present perfect progressive,5 simple past,6 past perfect,7 past progressive,8 past perfect progressive造句 就是说 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 求帮忙写10个英语句子!Present Perfect 时态的,5个用For,5个用Since.谢 present perfect continuous和present perfect simple的区别与用法 英语perfect什么意思