ago用法详解：一般不与现在完成时连用
<p>一、规则：在通常情况下 <span word="ago">ago</span> 只与过去时连用，而不与现在完成时连用。因为<span word="ago">ago</span>指的是多久以前的过去时间，而现在完成时表示的动作虽然发生在过去，但它强调的是与现在的联系或对现在的影响，因此两者不能用在一起。如：我两个月前见过他。误：<span word="I">I</span> <span word="have">have</span> <span word="seen">seen</span> <span word="him">him</span> <span word="two">two</span> <span word="months">months</span> <span word="ago">ago</span>. 正：<span word="I">I</span> <span word="saw">saw</span> <span word="him">him</span> <span word="two">two</span> <span word="months">months</span> <span word="ago">ago</span>.</p><p>二、特例：但是，有时为了行文的需要或使句子生动，<span word="ago">ago</span>可用于类似以下这样的句子：<span word="I">I</span> <span word="had">had</span> <span word="thought">thought</span> <span word="that">that</span> <span word="he">he</span> <span word="had">had</span> <span word="died">died</span> <span word="at">at</span> <span word="least">least</span> 20 <span word="years">years</span> <span word="ago">ago</span>. 我原以为他至少在</p><p>20年前就已经去世了。</p>
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