这里是情态动词表推测的用法：
情态动词+ 现在完成时 have +done 对已发生的事情的推测
情态动词+ 现在进行时 be + doing 对正在发生的事情的推测
情态动词+一般现在时be/do 对现在/将来的状态,事情的推测
you'd better+原形就是习惯搭配 表示你最好还是...
ought to +原形是情态动词,表示应当...
这两句话各是什么时态You’d better have had that experience before.假如你以前
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