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现在完成时:already ,yet,never,ever,for,since,这些词的用法及区别.

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现在完成时:already ,yet,never,ever,for,since,这些词的用法及区别.
比如说for+一段时间,这样的格式........(用法)
already 是己经的意思,eg:He has already eat breakfast .
yet用在句末,eg:He has not had any milk ,yet.
never从不,此为频率副词,eg:He has never eat egg.
ever 曾经,常用于现在完成时的疑问句中,:egHave you ever had French food?
for后跟一段时间,eg:I have already eat breakfast for yesterday .
since后跟时间点,eg:I have eat breakfast since half past seven .