peter had always been interested in plants是什么时态,always为什么要放在这个位置

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peter had always been interested in plants是什么时态,always为什么要放在这个位置
peter had always been interested in plants是什么时态,always为什么要放在这个位置

peter had always been interested in plants是什么时态,always为什么要放在这个位置
这句话是过去完成时态
always 的位置是正确的,即:助动词后,实义动词前
这句话中,助动词是 had ,实义动词是 be 的过去分词形式.