现在完成时可以和now连用吗

现在完成时可以和now连用吗

现在完成时还往往可以同包括现在时间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:
Peter has written six papers so far.
Man has now learned to release energy from the nucleus of the atom.
There has been too much rain in San Francisco this year.
The friendly relations and cooperation between our two countries have been enhanced in the past few years.
Up to the present everything has been successful.追问为什么可以用now追答你再读一遍就知道了，明白吗！追问- -我读了。我的意思是我学现在完成时的时候，老师说不可以和具体时间连用，而且seen是瞬间动词。那这两个不是矛盾了吗

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