didn't的过去式
“didn'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
英语:“used to do sth”的过去式是“didn't use to do sth”吗?
前面有didn't,后面的动词要不要变过去式?
为什么这个句子中didn't后面的动词要用过去式?
l didn't know what to say中didn't为什么用过去式
didn't 后面接动词原形 还是过去式
过去式的!佷急!例:I played football.I didn't tidy my room.1.我没有吃糖.2.
don't的过去式
didn"t you的意思
一般过去式第三人称单数形式否定句是加didn't还是does't?