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英语中什么时候该加is are were was .一直分不清,句子中总是多加,

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英语中什么时候该加is are were was .一直分不清,句子中总是多加,
英语中什么时候该加is are were was .一直分不清,句子中总是多加,
1.is 用法:第三人称单数现在进行时用,he she it 叙述客观现实时,象月亮绕地球转 地球绕太阳一类
2.are用法:第二人称单复均可,you.第三人称复数they,现在进行时用,
3.wrer用法:第二人称单复均可,you.第三人称复数they,一般过去时用.虚拟语气:if i were u .表被动,主语是复数,如computers were used to searched information
4.was用法:第一人称单数,I,一般过去时用.表被动,主语是单数,如computer was used to searched information