have to加动词的过去式,had to加什么?

have to加动词的过去式,had to加什么? Have后面加动词过去式和Had后面加动词过去式有什么区别? 动词的过去式有时加ed有时加t had /have to后是不是加动词原形啊? have been加动词过去啦式 与have 加动词过去式的区别 have的动词过去式是什么 did后面的动词要加过去式吗,那didn't呢还有don't呢,要加过去式吗 英语过去式中加了be后面的动词还要改过去式吗例：I had a lot of work to do last Saturday ,so I _____( not go ) out at all.和Sorry ,I don't know.I _____(not notice)him leaving.怎么写?快快快速度啊！！帮帮忙！！！ 动词的过去式有时加ed有时加t他怎么读啊 结尾是D的动词过去式/Id/结尾/d/的动词过去式结尾/t/的动词过去式如：collect taste/t/ /t/结尾是D的动词，直接加ed 情态动词have to的否定形式have to的否定形式是don't have to吧,而其他情态动词几乎都是后面直接加not,还有没有像have to这种的? have后能加动词的过去式吗? 动词加宾语加动词的过去式RT had watched TVI had watched TV,这应该是一般过去时吧,动词变过去时have变had,可是watch为什么也变成了过去式,过去完成时的结构是什么 have been后加动词原型还是过去式谢谢了, 过去式的用法be动词的过去式或had后面的动词用原形还是动词过去式?举例! have动词过去式 过去式的动词可以加ing