“didn't” 的过去式是什么?

“didn't” 的过去式是什么? didn't的过去式 didn't后面动词用原形还是过去式?句子中的didn't后面的动词用原形还是用过去式? needn't的过去式是什么 isn’t的过去式是什么 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 can't和want的过去式是什么? didn,t have any的同义词是什么 前面有didn't,后面的动词要不要变过去式?先说声谢谢了 t的过去式!带t的过去式 didn't 后面接动词原形 还是过去式 l didn't know what to say中didn't为什么用过去式 can't的过去式 can't的过去式 don't的过去式 英语：“used to do sth”的过去式是“didn't use to do sth”吗?不好意思啊，是否定式。 My compurt didn't work yesterday.的问句是什么 didn't think 和never thought 的区别是什么?