关于过去式和完成时的区别?I have just recevied a letter from my brother.这句话为什么是完成时,而不是过去式.一封信难道从过去一直收到现在这么长时间吗?I recevied a letter from my brother.这样才对嘛.信

关于过去式和完成时的区别?I have just recevied a letter from my brother.这句话为什么是完成时,而不是过去式.一封信难道从过去一直收到现在这么长时间吗?I recevied a letter from my brother.这样才对嘛.信 have you had dinner 和 did you have dinner 的区别是什么?完成时和过去式就不要说了.我想问翻译区别. 完成过去式和过去式有什么区别 I skated for 4 hours . I have been skating for 4 hours. I have skaked . 这三句话的区别.过去式,现在完成式,现在完成进行时,之间的区别是什么 so的倒装问题例如：So do i那么so 的现在完成进行时如何表示?so have been 那么过去进行时呢?so was 那和过去式有何区别? 英语过去完成时和过去式的区别For example:I have drank the water,和 I drank the water. 怎样区别一般过去式和完成时态的句子 完成时和过去式的区别—Hey,do not touth the chair .the paint’s still wet.—oh,sorry,——that.A.i am not seeing B.i have not seen C.i do not see D.i did not see选择D,我想知道为什么不是B.我希望能够以后碰到这类题, 一般过去式与完成进行时的区别谢谢~~ 英语一般过去式和现在完成时的区别I went to beijing 和 I have been to beijing 意思上有什么区别?能不能举例区分这两种时态? I have heard about it before这句话对么?before前加完成时还是过去式 I have fun in beijing的过去式 和 amy sees Sam every day的过去式 “过去时”和“过去式”的区别? 英语过去式和过去时的区别 过去式和现在时的区别? 一英语道题,关于现在完成进行时和一般过去式用法的区分.--Another cup of coffee?That's your third since lunch.--Yeah,well ,I______all night preparing for my history exam.I can't hardly keep my eyes open.A.stayed up B.have stayed 一个英语问题...have和hadI had a bad cold .还是 I have a bad cold .一般,过去分词,过去式的用法,区别.[列举几个句子, 现代完成时和过去完成时的区别i have never seen before i had never seen before这俩一个是现代完成时，一个是过去完成时，有什么区别？