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5、用在suppose开头的祈使句中，从句的谓语动词变化与as if后面的动词变化规律相同，用过去式、过去完成式、或过去将来式。意思是“假如…”，但suppose 是动词，不是连词。如：
    Suppose the boss walked in. What should I do?
    Suppose Saddam had not been captured. What would the U.S. do?
    Suppose Chen Shui-bian should declare Taiwan independent. What would China do?
    6、用在for fear that或lest引导的从句中，表示“怕…”“万一…”等意思。从句的谓语动词用should＋动词原形，should 可以省略。如：
    She closed the windows for fear that she (should) catch cold.
    The officer forbade the use of artillery lest the city’s industry be damaged.
    Lest the wall should collapse, they evacuated from the building.