[误] He or his parents has some tickets for the film.
[正] He or his parents have some tickets for the film.
[析] 由or 连接两主语时,谓语动词应与相临近的那一个主语保持一致。
[误] You should study hard, and you won't pass the exam. [正] You should study hard, or you won't pass the exam.
[析] or作为连词,这里的意思为"否则"。又如:Hurry up, or you'll be late for school.
[误] Though he is poor, but he is ready to help others.
[正] Though he is poor, he is ready to help others.
[正] He is poor, but he is ready to help others.
[析] "虽然……但是"是中文中的常用结构,但在英文中用了"虽然"则不要用"但是",用了"但是"则不能再用"虽然",二者只可用其一。
[误] Either you or I are on duty.
[正] Either you or I am on duty.
[析] either…or 连接两个主语时,其谓语动词与相临近的一个主语相呼应,这也叫作就近原则。类似的用法还有or, neither… nor, not only…but also等。
[误] Tom is our English teacher and teaching English in our school now.
[正] Tom is our English teacher and is teaching English in our school