现在完成时的使用注意点（一）
（1）不能和明确的时间搭配，比如：yesterday(morning、afternoon),last(morning、year)等，但可以与for, since连用。
例句：
（错误）I haven't seen her yesterday.
（正确）I haven't seen her for a long time. 我很久没见到她了。
（错误）I've been here last morning.
（正确）I've been here since the end of June. 自6月末以来我就一直呆在这儿。
（2）同表示不明确的过去时间状语连用，如already（肯定）, yet（否定，疑问）, just, before, recently, still, lately等。
例句：
I have already done my homework.
惠特曼草叶集我已经写完作业了。
I have seen him before.
我以前曾经见到过他。
The pupils have not yet learned to punctuate correctly.
小学生尚未学会正确使用标点符号。
She hasn't been feeling well lately and she let the housework slide.
她近来一直感到不适, 对家务也就随它去了。
the soap's ratings have recently picked up.
这一肥皂剧的收视率近来提高了。
The doctor was here all morning, but you've just caught him out.
整个上午医生都在这里，现在你却正好碰到他不在。
另外注意just, already, recently等的用法，并不一定都是现在完成时。
例如：
1.She didn't realize her mistake yet.
她还没有认识到她的错误。（一般过去时）
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2. The place was recently visited by a serious volcanic eruption.
这地方最近发生了一次严重的火山爆发。（一般过去时）
3. Six months passed and still we had no news of them.
六个月过去了，而我们还没有关于他们的消息。（一般过去时）
4.I just flipped through the book to see what it was like.
我只是浏览了一下这本书看看它怎么样。（一般过去时）
化为齑粉在完成时的使用注意点（二）
（1）与表示频率的时间状语连用，如ever, never, twice, on several occasion等。
例句：
1.I have never lost the weight I put on in my teens.
粉爱我十几岁时增加的体重一直没有减下去。
2.After pondering the question on several occasion, I have finally arrived at conclusion that stock market investment should not be recommended to most college students.
在多次思考这个问题之后，我最终得出结论，对于大部分大学生来说，不应该进行股票交易。
注意：表频率的时间状语也用于其他的时态，如一般现在时：I play tennis twice a week. 我一周打两次网球。
（2）可以同包括现在在内的时间状语连用，如now, up to these few days/weeks/months/years, this morning/week/month/year, just, today, up to present, so far等。
例句：
1.I have just spent a holiday there and would recommend it to anyone.
我刚刚在那里度过假，很想把它推荐给每一个人。
2.I think this stems from the fact that, up to now, very little interest has been paid to this fr
ankly less than incendiary topic.
我想这种现象源于这个事实，那就是，直到目前为止，公众投入这一问题的兴趣、坦率地讲要少于煽动性话题。
3.Up to now, I have finished two-thirds of the work.
到现在为止，我已完成了这个工作的三分之二。
4.So far we haven't been able to find anything, but we're still researching.
目前我们还没有任何发现，但是我们仍在研究。
跋山涉水5.What has happened to the youth of this generation, which has set it so far apart from the rest? 在这些年轻人身上到底发生了什么，使他们与其他的同龄人有着这么大的分歧？
（3）可以表示过去的一个时间点到现在这段时间内重复发生的动作。
例句：
We have had five texts this year.
我们今年有5个测试。
（4）一段时间+has passed + since从句
例句：
Two weeks has passed since the new term began.
开学以来两个星期已经过去了。
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