姓名_现在完成时构成：have（助动词）+ done，助动词have第三人称单数用has，其余用have.用法：现在完成时通常表示在说话之前已经完成的动作或存在的状态。强调该动作或状态对现在造成的结果或影响。I.与完成时连用的副词有： already 已经 (肯定句) have already doneyet已经 (疑问句末)have doneyet? 还 (否定句末)havent doneyetnever 从不have never done since (“自从”“since+时间点/过去式的句子，用于句末。)ever 曾经have ever donejust 刚刚已经 have just done for (“多久”“for+时间段” 用于句末)Use “never, ever, already, just, yet, for, since” to fill in the blanks.1. I have _ seen h
