use 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“雖然……，但是…… ”或用because, so 表示“因為……，所以……”時，though和but 及because和so 都只能擇一而用，不能兩者同時使用。
Smiths have moved Beijing. (×)
The Smiths have moved to Beijing. (√)
[析] 不及物動詞後接名詞或代詞作賓語時，要在動詞之後加上適當的介詞;但不及物動詞後接home, here, there等副詞作賓語時，動詞之後不必加任何介詞。
box is too heavy for him to carry it. (×)
The box is too heavy for him to carry. (√)
[析] the box既是這句話的主語, 也是不定式to carry的邏輯賓語，若句末再加上it，就和the box重複了。
of the boys have a pen. (×)
Each of the boys has a pen. (√)
[析] 複數名詞前有表個體的each of, one of, every，either of等片語修飾，或有表否定的neither of, none of 等片語修飾時，謂語動詞要用單數形式。
5.例:那是你心軟!我不就是一個例子嗎?
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... 等片語連線句子的`兩個主語時，謂語動詞遵循“就近一致原則”, 即由靠近謂語的那個主語決定謂語的人稱和數用何種形式。
minus three are seven. (×)
Ten minus three is seven. (√)
[析] 用英語表示加(plus)、減(minus)等數學運算時，謂語動詞也用單數形式。
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“……的數量”，謂語動詞用單數形式;a number of 的意思是“若干”或“許多”，相當於some或a lot of，和複數名詞連用，謂語動詞用複數形式。
8. 例. Hello! I have important something to tell you. (×)
Hello! I have something important to tell you. (√)
[析] 形容詞或動詞不定式修飾不定代詞作定語時，修飾成分要置於不定代詞之後。
9. His son is enough old to go to school. (×)
His son is old enough to go to school. (√)
[析] enough作形容詞修飾名詞時，可以放在名詞前，也可放在名詞後;作副詞修飾形容詞或副詞時，只能放在形容詞或副詞之後。
10.. Here is your sweater, put away it.(×)
Here is your sweater, put it away. (√)
[析] put away, pick up, put on等“動詞+副詞”構成的片語後接代詞作賓語時，代詞只能放在動詞和副詞之間。