“a moment”的用法是什么?应该放在什么样类型的单词后边?

在这里 是short time 短时间的意思 ： a very short period of time 片刻 瞬间 刹那
举例如下：
He was here a moment ago. 他刚刚还在这里.
可以有如下句型搭配：
in a moment ：马上,很快
e.g. I'll come back to that point in a moment. 我马上还会回过来谈那一点.
for a moment
e.g. It was quiet for a moment, then Rae spoke. 沉寂了片刻,雷就开始说话了.
after a moment
e.g. " I don't understand," said Louise after a moment. " 我不懂.“ 过了一会儿路易斯说道.
wait / just a moment ( used when you want someone to wait a short time while you do or say something) 等一下
e.g. Just a moment； let me put these away first. 等一会儿,让我先把这些东西收起来.
We have to be ready to leave at a moment 's notice (= very quickly）我们必须准备好随时离开.
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wait for a moment

常见的就有
A moment= in a moment = wait a moment = just a moment =等一会
after a moment = 过了一会
a moment ago=刚才

a moment:一刻，片刻。一般放在动词后。

• take a moment花一些时间

• wait for a moment /wait a moment 等一下

那“a moment”前面应该是什么...