问题标题:
为什么用havewarned而不用过去式?AUnitedNationsenvoyMartinKoblerhaswarnedthatIraqisatacrossroadsafterawaveofviolence,whichhasleftmorethan150peopledeadsinceTuesday.
问题描述:

为什么用havewarned而不用过去式?

AUnitedNationsenvoyMartinKoblerhaswarnedthatIraqisatacrossroadsafterawaveofviolence,whichhasleftmorethan150peopledeadsinceTuesday.

龚炳江回答:
  这里强调的是结果.即已经警告了sth,而不是强调曾警告过stm.
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