有关have的用法.请问Have+过去试是说过去不确定时间或仍持续的时候用的,但我不明白什么时候用Had+过去式和Has+过去式?例：Someone had told me.为什么不用someone has told me.那么,He has sent a great many me

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有关have的用法.请问Have+过去试是说过去不确定时间或仍持续的时候用的,但我不明白什么时候用Had+过去式和Has+过去式?例：Someone had told me.为什么不用someone has told me.那么,He has sent a great many me
有关have的用法.
请问Have+过去试是说过去不确定时间或仍持续的时候用的,但我不明白什么时候用Had+过去式和Has+过去式?例：Someone had told me.为什么不用someone has told me.那么,He has sent a great many messages.为什么不用He had sent a great many message呢?还有能详细说说Have的用法吗?现在好混乱啊

有关have的用法.请问Have+过去试是说过去不确定时间或仍持续的时候用的,但我不明白什么时候用Had+过去式和Has+过去式?例：Someone had told me.为什么不用someone has told me.那么,He has sent a great many me
has/have+过去式是现在完成时表示动作发生在过去,一直持续到现在,并对现在造成的影响.
had+过去式表示过去完成时表示动作在过去并且已经完成.
二者的用法需要根据句义来判断,一般会有时间提示的.

请问一下have throuble、 have difficulty 、have problem的用法请问一下have throuble have difficulty have problem的用法, have been studying过去进行?用法?have been studying是过去进行吗它意思是什么?过去进行的用法? have 动词过去分词.和have been 过去分词的用法请问was 与have been用法的区别was也是be动词在表示过去时时如何区分was 和have be的不同用法. have与had的用法had+过去分词表示发生在过去的过去,什么是过去的过去?have与had还有其他用法, 请问have got 的用法是什么? 请问“have”与“have got”的区别用法? have+过去分词和have been+过去分词的区别请问 have been+过去分词是什么时态. have的过去分词 have的过去分词有关have的用法.请问Have+过去试是说过去不确定时间或仍持续的时候用的,但我不明白什么时候用Had+过去式和Has+过去式?例：Someone had told me.为什么不用someone has told me.那么,He has sent a great many me 英语have been studying过去进行?用法?have been studying是过去进行吗它意思是什么?过去进行的用法? have been seeing /have been seen/ have seen的用法.以及I was saw 和I saw的用法请说清楚过去时和完成时的用法. have got 的用法 have been 的用法? have problems的用法 have的用法 have problem的用法