1.at the moment\in a moment\for a moment\
at the moment=right now"此时此刻",用于现在时。
in a moment = very soon “很快,立即”,一般用于将来时的句子。
for a moment “此刻,一会儿”表示时间的延续。
[例] He is out at the moment.此刻他不在家。
I will come back in a moment.我一会儿就回来。
Hold on for a moment.请稍候。
2.a few/ few
(1)a few, few 用来修饰可数名词。
(2)a few “有一些”,表示肯定概念,few 几乎没有,表示否定意义。
[例] The man has been here for many years, so he has a few friends.
这个人在这里住了很多年了,他有一些朋友。
I am a new comer here, so I have few friends here.
我刚来到这里,所以我在这里没有几个朋友。
3.a little/ little
(1) a little, little 用于修饰不可数名词。
(2) a little “有一些”,表示肯定概念。
little “几乎没有”,表示否定概念。
[例] There is a little water in the glass.杯子里有一些水。
There is little water in the glass, so you can’t drink any.
杯子里几乎没有水了,你不可能喝到水了。
4.across / through
二者都有“通过,穿过”的意思,都是介词,但“through“与空间有关,
即一个人或物体从某空间之间穿过,如:
Look out through the window, please.请从窗口往外看。
We have to walk through the gate to go into the factory.
我们要走进这家工厂必须走过这一扇大门。
across也是“通过”、“跨过”,一般与位移的平面有关,
即从一个平面的一头走到或越到另一头。如:
If you walk across the square, you will see the hotel there.
如果你走到广场的另一端,你就看到旅馆了。
Be careful when you walk across the street.过马路时要小心。
注意:cross是及物动词而across是介词。