在一些词组中，不定冠词a/an与一些词的搭配用法是约定俗成的，我们只有遵从，没有别的选择。我们收录了这些固定搭配用法供你学习和记忆。
get a fever/have a fever 发烧
这两个都是指发烧，没有什么太大的区别，用法上不必太较真,如果真要区别的话 have a fever 强调的是一种状态延续性的。 get a fever强调的是动作，也就是指短暂性的。
列句：
I'm really fine. I just have a fever.
我真的没事，只是有点发热。
I got a fever after walking in the rain。
淋雨之后我发烧了。
have a rest 休息
It's nice and cool here. Let's sit down and have a rest.
这里凉快，坐下来歇会儿。
have a look 瞧瞧，看一看
Can I have a look at that? 我能不能看一眼那个？
have a good time 过得开心
You can still do your job and have a good time.
你仍然可以做你的工作并且过的愉快
have a nice trip 旅途愉快
Anyhow, I hope you'll have a nice trip. 无论如何，祝你旅途愉快吧！
take a break 休息
Yes, I know we should take a break. 是的，我知道，我们该休息了。
have a bath/take a shower 洗澡
I'm ready to take a bath! 我准备好去洗澡了！
Before I have dinner, usually I take a bath. 吃晚饭以前，我通常先洗澡。
have a cold 患感冒
develop into a habit 养成习惯
Although enjoying life is important, it is also necessary to develop a good habit of saving money.虽然享受生活很重要，但是养成良好的节约习惯也十分必要。
make a living 谋生
Maybe this time, I will be able to make a living from my talent. 或许这一次，我能凭借自己的才能谋生了。
make a guess at 猜测
Can you make a guess at her occupation? 你能猜出她的职业吗？
make a difference between区分
make a distinction between A and B = make a difference between A and B 区别A和Bmake a distinction between(在…之间)加以区别，指出(…之间)的不同，如：
We must make a distinction between freedom and license.
我们必须把自由和放纵“区分”开来。
in a moment 过一会儿
In a moment he was gone 一转眼他就不见了。
in a sense 在某种意义上
In a sense, both were right.从某种意义上来说，两者都对。
He is right in a sense. 就某种意义来说，他是对的。
in a way 在某种程度上
He dresses in a way that lets everyone know he's got authority. 他的穿着打扮让大家都知道他已经掌权了。
once in a while 间或
He comes to our room for a chat every once in a while.他偶尔来我们房中闲谈。
have an advantage over 优于
I will have an advantage over others. 我会比别人有优势。
have an edge 略胜过
But I have an edge. I have his daughter.
但我有他女儿，我占上风。
We have an edge over the other team in height, so I'd say the odds are in our favor.
我们在身高上比另一队占优势，因此我觉得我们胜算很大。
as a result 因此
as a rule 通常
When does he come as a rule？通常他什么时候来？
As a rule， he gets up at five o'clock and does morning exercises in the park．他通常5点起床，在公园里做早操。
as a whole 总体上说
All Party members and the people as a whole are full of vigour. 党员和人民的精神状态很好。