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5. 其主要的难点是用在固定词组中：
如：have a walk/a rest /a look
又如：in a hurry 匆匆忙忙
make a face 作鬼脸
do somebody a favour 帮某人忙
a number of =many
又如：have a good time (玩得好)
have a cold (感冒)
have a headache (头痛)
have a break=have a rest
［误］I bought the dictionary yesterday. A dictionary is very good.
［正］I bought a dictionary yesterday. The dictionary is very good.
［析］在文章中第一次提到某物时用不定冠词，而第二次提到时用定冠词。
［误］Please turn off lights before you leave.
［正］Please turn off the lights before you leave.
［析］虽然是第一次提到某物但说话双方均知其所指，也应用定冠词。
［误］There are nine planets around a sun.
［正］There are nine planets around the sun.
［析］世上独一无二的天体等名词前应加定冠词，如：the earth, the moon, the sun, the sky, the sea.
［误］I live on a second floor of this building.
［正］I live on the second floor of this building.
［析］在序数词，形容词最高级前要用定冠词。如：He is the oldest in the family.
［误］I want to learn the second language this term.
［正］I want to learn a second language this term.
［析］在序数词的含意不是顺序中的第一第二，而其意在于再学一个，再来一个时，应用a，本句的意思应为：这学期我要学一门第二外语。
［误］Mississippi is one of the longest rivers in the world.
［正］The Mississippi is one of the longest rivers in the world.
［析］在河流名称前应加定冠词，如：the Yellow River(黄河)。
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