did的句子-did开头的句子-什么时候句子要加did
did 有两大用法，1.一个是过去式的助动词。在一般疑问句，否定句，特殊疑问句中使用。 例如：Did you clean your room? He did not do his homework. What did you do? 2.表示做。She did her homework last nig...
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did 有两大用法，1.一个是过去式的助动词。在一般疑问句，否定句，特殊疑问句中使用。 例如：Did you clean your room? He did not do his homework. What did you do? 2.表示做。She did her homework last nig...