过去时与现在完成时的区别1)i bought a new computer. i've bought a new computer.2)they stated that they would continue the strike.they have stated that they will continue the strike.3)i told you not to.i've told you not to.4)the action was

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过去时与现在完成时的区别1)i bought a new computer. i've bought a new computer.2)they stated that they would continue the strike.they have stated that they will continue the strike.3)i told you not to.i've told you not to.4)the action was
过去时与现在完成时的区别
1)i bought a new computer. i've bought a new computer.
2)they stated that they would continue the strike.
they have stated that they will continue the strike.
3)i told you not to.
i've told you not to.
4)the action was completed.
the actiion has been completed.
5)he wrote a book.
he has written a book.
以上例句的两种不同时态有什么不同意义?请每组详细分析两种时态差异,最好还能总结下,谢谢.
experiments have proved that .....
it has sailed accross the atlantic .

过去时与现在完成时的区别1)i bought a new computer. i've bought a new computer.2)they stated that they would continue the strike.they have stated that they will continue the strike.3)i told you not to.i've told you not to.4)the action was
前句强调我买电脑这一具体动作,而后句强调现在我有电脑了的结果.前句强调他们在过去声明了,后句强调他们声明后的影响.前句指我告诉过你,后句强调我告诉你你没听导致怎样结果有责备意味.过去时强调具体在过去发生的动作,而完成时强调结果和影响,求分啊