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. (√)
