新东方考研语法讲堂87

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2、用在as if/as though,或even if/even though引导的从句中: 这时，如果从句中表示的动作发生在过去，则谓语动词用had＋过去分词形式；如果指的时现在的状况，则用过去式(be用were)；指将来则用would(should, could)+动词原形。这里只看从句动作发生的时间，与主句的时态没有关系。
    For example:
    Some metals look at first sight as though they were gold.
    He looked as if he were an artist.
    He speaks English so fluently as if he had studied English in the U.S.
    He always sounds as if he would help you.
    When a pencil is partly in a glass of water, it looks as if it were broken.
    Even if he were here, he could not solve the problem.
   
    看她的样子，好像生病了。
    She looks as if/though she were ill.
    他走起路来就好像他是国王。
    He walks as if he were a king.
    他表现得若无其事。
    He acted as if nothing had happened.
    即使天塌下来，他也不会辞职。
    He would not resign even if the heaven should collapse.