名词moment表示“片刻，瞬间，时刻”。比如：The room was silent for several moments.室内寂静了片刻。下面学习由其构成的三个常见短语at the moment、for the moment、in a moment及the moment (that)的用法。
另外，the moment（that）是常考点，常以选择填空形式考察。at the moment和for the moment的意思区别也要搞清楚。
1.at the moment的意思是“此刻，现在”，表示某特定时间点发生的事情。比如：
It's quite warm at the moment.现在天气相当暖和。I'm only part-time at the moment.我现在只是兼职。
At the moment it is only a theory.眼下，它还只是个理论而已.He's on the telephone at the moment.他正在打电话。
She's in cracking form at the moment.她这会儿状态好极了。I can't think of her name at the moment.我一时想不起她的名字。
2.for the moment的意思是“暂时，暂且”。比如：
They are living with their parents for the moment because their own house is being built.他们暂时和父母住在一起，因为他们自己的房子正在建筑中。
It's a complex issue, and I should leave it having said this much, at least for the moment.这是一个复杂的问题，我应该先说这么多，至少暂时这样。
He was just going to speak when he thought better of it and didn't mention it for the moment.他刚想开口说话，但一转念，觉得还是暂时不提为好。
3.in a moment指“立即，马上”。比如：
When he saw this small newcomer his soul was all ablaze with bliss in a moment.当他看到这个新来的小家伙时，他的心里立刻燃起了幸福的火焰。I agreed in a moment of weakness.我一时心软就答应了。
I'll be back in a moment.我马上就回来。In a moment he was gone.不一会儿他就不见了。He talked to the press in a moment of indiscretion.他一时冲动对新闻界发表了讲话。
In a moment of madness she had agreed to go out with him.由于一时糊涂，她同意和他约会。I'll think of his name in a moment when it comes back to me.我想一下，一会儿就能记起他的名字来。
4.the moment（that）的意思是“一……就……”，它指在某个特定的时刻，表示某个事件或情况发生的具体时间点。that在句子中可以省掉。The moment(that)常可以与the minute that、as soon as互换使用。这是英语考试中的考点，需要注意。比如：
The moment I closed my eyes, I fell asleep.我一闭上眼睛就睡着了。
I want to see him the moment he arrives. 希望他一到我就见到他。She telephoned her father the moment she reached the hotel她一到旅馆就给她父亲打了电话。