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。

　　5.例：那是你心软！我不就是一个例子吗？

　　Neither he nor you is good at English. (×)

　　Neither he nor you are good at English. (√)

　　[析] either…… or……，neither…… nor……，not only……，but also……等词组连接句子的两个主语时，谓语动词遵循“就近一致原则”，即由靠近谓语的那个主语决定谓语的人称和数用何种形式。

　　6.Ten minus three are seven. (×)

　　Ten minus three is seven. (√)

　　[析] 用英语表示加(plus)、减(minus)等数学运算时，谓语动词也用单数形式。

　　7.The number of the workers in this factory are about 5，000. (×)

　　The number of the workers in this factory is about 5，000. (√)

　　[析] the number of表示“……的数量”，谓语动词用单数形式；a number of 的意思是“若干”或“许多”，相当于some或a lot of，和复数名词连用，谓语动词用复数形式。

　　8. 例. Hello！ I have important something to tell you. (×)

　　Hello！ I have something important to tell you. (√)

　　[析] 形容词或动词不定式修饰不定代词作定语时，修饰成分要置于不定代词之后。

　　9. His son is enough old to go to school. (×)

　　His son is old enough to go to school. (√)

　　[析] enough作形容词修饰名词时，可以放在名词前，也可放在名词后；作副词修饰形容词或副词时，只能放在形容词或副词之后。

　　10.. Here is your sweater， put away it.(×)

　　Here is your sweater， put it away. (√)

　　[析] put away， pick up， put on等“动词+副词”构成的词组后接代词作宾语时，代词只能放在动词和副词之间。