wasn't didn't isn't的用法 各举两个例子

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wasn't didn't isn't的用法 各举两个例子
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wasn't didn't isn't的用法 各举两个例子
wasn't didn't isn't的用法 各举两个例子

wasn't didn't isn't的用法 各举两个例子
1.wasn't是be动词isn't的过去时,用于过去进行时.
如：1.he wasn't at home yesterday.
2.I wasn't doing my homework yesterday,I was reading books.
2.didn't是“do" "does"的过去时,用于过去现在时.
如：1.I didn't go to the library last week.
2.he didn't take a shower until his mother came back.
3.isn't是一般现在式,后面一般加动词--ing形式
如：1.he is dancing in the gym
2.is she playing football on the playground?

先说wasn't和isn't
着两个都是be 动词.只是时态不一样.
前者用语一般过去,后者用于现在时态.
都表否定.
通常根据句子意思来确定时态.
例如:I wasn't in the hospital yesterday. 我昨天没有在医院(过去)
She isn't a good girl. 她不是一个好女孩(目前的情形)

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先说wasn't和isn't
着两个都是be 动词.只是时态不一样.
前者用语一般过去,后者用于现在时态.
都表否定.
通常根据句子意思来确定时态.
例如:I wasn't in the hospital yesterday. 我昨天没有在医院(过去)
She isn't a good girl. 她不是一个好女孩(目前的情形)
再说didn't
是“do" "does"的过去式,是助动词。
用法和do,does一样
只是要根据时态人称来变化。
例如：He didn't buy that expensive book.他没有买那本昂贵的书
上一楼举的例子也不错，你可以参考一下
希望你有所收获

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