问题描述:
is being 和are being
适合什么时候用?请举例
附加提问:过去式could后面不用pat tense
比如:i could dance very well when i was still young..
适合什么时候用?请举例
附加提问:过去式could后面不用pat tense
比如:i could dance very well when i was still young..
问题解答:
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