这句话为什么用when而不用that?I will not forget the days when we studied together.日子是忘记的宾语,为什么要用when?我觉得应该是that 或者which呀?可是那是宾语啊

这句话为什么用when而不用that?I will not forget the days when we studied together.日子是忘记的宾语,为什么要用when?我觉得应该是that 或者which呀?可是那是宾语啊 (when i arrived,i found the door closed.)这句话为什么要用closed而不用closing. I have learned a lot that way .这句话中为什么直接用that way ,而不用by that way或in that way It was on July 1,1988 that I joined the army为什么要用that,而不用when/which When I looked out of the window,I saw(see)some birds.这句话不是过去进行时吗?为什么不用seeing而用saw? I still remember the day（that）i went to college为什么用that?而不用which,或when?I still remember the day (that) I went to college.这句不是定语从句吗？ I have a dream that one day we could meet这句话中,关系代词为什么用that而不用which My father can't stand it ,when people make noise during the concert这句话对吗这个句子中的when用得对吗?为什么用that而不用when I'm stuck in a moment这句话为什么不用I而用I'm呢? I'll never forget the days_____I joined the League.为什么填when 而不用that it was yesterday when he play这句话为什么不用when?要改成that? 什么时候用where而不用that?例如 Last summer he went to the city______he had visited twice.这句话横线上为什么只能填that,而不用where？ It was at 11olock that i arrived home.为什么用that 不用when 在英语从句中,如何分辨where和that的用法?如 I like place where the weather is warm.为什么这句话中用where而不用that 什么情况下用where？什么情况下用that i believe i can fry和i think that you will pass the exam.这2句话都是宾语从句,为什么第一句话不用加that 而第二句要呢 must have do 句型,比如when i suggested that some villagers must have come in for free drink这里为什么用must have come啊?不用过去式吗?这是什么句型这句话? My mother was so tired that she fell asleep when watching TV为什么when后用watching而不用watched This is the very person that I am looking for为什么用that 而不用whom