【誤】I need the second car.

【正】I need a second car.

我還需要另外一輛車。

a second表示“再一的，另一的”。如：

Your shes may get wet. Bring a second pair.

你的鞋可能會(huì)濕，帶上一雙備用。

【誤】He went up the stairs two at one time.

【正】He went up the stairs two at a time.

他兩步并一步上了樓梯。

at a time是“每次，一次”。at one time = in the past是“曾經(jīng)，一度”的意思。如：

At one time, Nigeria was a British colony.

過(guò)去尼日利亞曾是英國(guó)殖民地。

【誤】As a matter of the fact, he was the one who broke the window.

【正】As a matter of fact, he was the one who broke the window.

事實(shí)上，他就是打破窗子的人。

as a matter of fact = in fact是個(gè)固定詞組

【誤】You needn't be in such hurry.

【正】You needn't be in such a hurry.

你不必如此匆忙。

in a hurry是固定詞組，表示“匆忙，立即”。

【誤】His brother had the high fever.

【正】His brother had a high fever.

他弟弟昨天發(fā)高燒。

表示“生病”時(shí)，以have構(gòu)成的詞組要用a，have a cold/cough/fever/pain/headache，另外還有have a good time，have a talk with sb.，have a meeting/match

以catch或take構(gòu)成的詞組，如：

catch a cold，take a cold，可省去a

如果名詞前有形容詞時(shí)，則都不可省。

“患流行性感冒”用a或the均可。如：

have a flu

have the flu