分析 has been in the army.
解答 答案:has been in the army.这里参军join the army这个动作发生在三年前,持续了三年了用现在完成时have/has+过去分词,主语是Li Ming's brother三单故用has,时间状语是for three years 是一段时间,join是短暂性动词,不能与一段时间连用,故换成be in the army表状态,be的过去分词是been,故答案是has been in the army.
点评 瞬间动词可以用于现在完成时,但不能和表示一段时间的状语连用如:for 和since 所引导的时间状语都表示一段时间.那就要将瞬间动词转化为表延续的动词或者表状态的be+名词/形容词或副词/介词短语等.
leave-been away from buy-have borrow-keep die-be dead get up-be up put on-be on/wear
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