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   　　1.Because he was ill yesterday, so he didn’t go to work. (×)

　　　　Because he was ill yesterday, he didn’t go to work. (√)

　　　　He was ill yesterday, so he didn’t go to work. (√)

　　　　[析] 用though, but表示“虽然……，但是…… ”或用because, so 表示“因为……，所以……”时，though和but 及because和so 都只能择一而用，不能两者同时使用。

　　　　2.The Smiths have moved Beijing. (×)

　　　　The Smiths have moved to Beijing. (√)

　　　　[析] 不及物动词后接名词或代词作宾语时，要在动词之后加上适当的介词;但不及物动词后接home, here, there等副词作宾语时，动词之后不必加任何介词。

　　　　3.The box is too heavy for him to carry it. (×)

　　　　The box is too heavy for him to carry. (√)

　　　　[析] the box既是这句话的主语, 也是不定式to carry的逻辑宾语，若句末再加上it，就和the box重复了。

　　　　4.Each of the boys have a pen. (×)

　　　　Each of the boys has a pen. (√)

　　　　[析] 复数名词前有表个体的each of, one of, every，either of等词组修饰，或有表否定的neither of, none of 等词组修饰时，谓语动词要用单数形式。