81. 她快快地吃完早餐就去上班了。

误：She had quick breakfast and went to work.

正：She had a quick breakfast and went to work.

析：若 breakfast若受到形容词的修饰，表示某顿具有某种特征的早餐时，则其前要用不定冠词。注：lunch, supper也具有类似用法特点。

82. 你至少要换两次车。

误：You'd have to change bus at least twice.

正：You'd have to change buses at least twice.

析：change buses(转车)中的 buses 总是用复数，因为既要下一辆车，又要上另一辆车。比较：change trains(转车)，change seats(交换座位)等。

83. 同学们正忙于复习准备考试。

误：The students are busy to study for her exams.

正：The students are busy studying for her exams.

析：要表示“忙于做某事”，be busy 后可要接doing sth，不能接to do sth。不过，有时也接 in doing sth。如：He was busying (in) writing a report. 他正忙于写一个报告。

84. 这房子我已买了十年。

误：I have bought this house for ten years.

正：I bought this house ten years ago.

正：I have had this house for ten years.

正：It's ten years since I bought this house.

析：buy 是终止性动词，因此在肯定句中不能与一段时间连用。遇此情况，应改用其他相应句式。

85. 这个东西用英语怎么说?

误：How do you call this in English?

正：What do you call this in English?

正：How do you say this in English?

析：What do you call… 与How do you say… 意思相同，但搭配不同，即：call 与 what 搭配，say 与 how 搭配，两者不可混在一起。

86. 我们信任我们的老板。

误：We believe our boss.

正：We believe in our boss.(www.yygrammar.com)

析：believe sb 指“相信某人说的话”，believe in sb指“相信某人的为人”或“信任某人”。又如：I can believe him, but I can not believe in him. 我相信他说的话是真的，但是不相信他的为人。

87. 铃还没响，同学们就走了出去。

误：The students went out before the bell didn’t ring.

正：The students went out before the bell rang.

析：before 表示“在……之前”，before the bell rang指的就是“在铃响之前”，既然是铃响之前，当然就是铃还没响。也就是说汉语的否定意味已包含在 before 当中，所以该从句不再用否定式。

88. 他可能已经把这情况告诉她了。

误：He could tell her about the matter.

误：He can have told her about the matter.

正：He could have told her about the matter.

析：要表示对过去可能已发生动作进行推测，英语不能用“could + 动词原形”，而要用“情态动词+动词完成式”的形式。由于 can 表示推测不用于肯定句中，所以上面第二句是错的。

89. 你必须好好照看这些小植物。

误：You must take a good care of these little plants.

误：You must take good cares of these little plants.

正：You must take good care of these little plants.

析：care 用作名词表示“注意”“小心”“关心”等义时，是不可数名词，既不能用复数形式，也不能在其前使用不定冠词。

89. 老师进来时撞见几个男孩子在抽烟。

误：The teacher caught some boys to smoke when he entered.

正：The teacher caught some boys smoking when he entered.

析：表示意外地碰上某人在做某事，英语习惯上要用 catch sb doing sth，而不能用 catch sb to do sth。

90. 因为禽流感的原因，现在的鸡价很便宜。

误：Hens are selling at a cheap price because of the bird flu.

正：Hens are selling at a low price because of the bird flu.

正：Hens are selling cheap because of the bird flu. (http://ask.yygrammar.com/)

析：cheap 表示“便宜的”“价廉的”，一般用来修饰具体的东西，而不宜修饰像价格(price)，工资(salary / wages)这类较为抽象的概念。要表示价格低，可用low修饰要表示卖得便宜，除可用 sell at a low price 外，也可用 sell cheap, sell cheaply 等。