介词后面何时接定冠词?何时接不定冠词?

问题描述:

介词后面何时接定冠词?何时接不定冠词?
比如 on in at 后面接定冠词还是不定冠词是根据名词来确定的吗?
Life on a desert island is wretched.
这个island是可数名词 所以用
fish live in water.
water是不可数.

用the还是a还是不用与下列因素有关:1)含义Life on a desert island is wretched.荒漠岛上的生活很悲惨.意思是:任何荒漠岛都如此.荒漠岛是个变量.Life on the desert island Captain Cook discovered was enjoyabl...