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Theteacherhashelpedmesolvetheproblem.这句话中help为什么要加ed?顺便帮我多举几个这种用法Theteacherhashelpedmesolvetheproblem.这句话中help为什么要加ed?顺便帮我多举几个这种用法

题目详情
The teacher has helped me solve the problem.这句话中help为什么要加ed?顺便帮我多举几个这种用法
The teacher has helped me solve the problem.这句话中help为什么要加ed?顺便帮我多举几个这种用法
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答案和解析
现在完成时的结构:have / has +动词的过去分词,即( has helped 是现在完成时结构)
又如
He has finished his homework.
He has worked for ten years.
They have learned English for three yreas .