科研之友
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<正>现在帮大家总结一下现在完成时句子中常见的标志词,让大家轻松掌握现在完成时。请看:1.句子中有:already, yet, just, ever, never, before, recently, so far,over the years, in the past/last few years等。如:I have already finished my homework.He has never seen such an interesting film before.So far, they have planted over a hundred trees.【温馨提示】already通常用于肯定句中;yet通常用于否定句或疑问句中。2."in the past/last+一段时间"。如:
