(1) 不定冠词的位置。不定冠词常位于名词或名词修饰语前,但是下列情况除外:①位于下列形容词之后:such,what,many,half。如:such an animal;What a beautiful house! many a man(许多人);half an hour。②当名词前的形容词被副词as, so, too, how等修饰时,不定冠词应放在形容词之后。如:as pleasant a day as I have ever spent;so short a time;too long a distance;how clever a girl。③quite同形容词连用修饰名词时,应置于不定冠词前。如:quite a different problem。④在as,though引导的让步状语从句中,当表语为形容词修饰的名词时,不定冠词放形容词后:Brave a man though he is(=though he is a brave man),he trembles at the sight of snakes.(他尽管勇敢,可见到蛇还是会发抖。)
(2)定冠词的位置。定冠词通常位于名词或名词修饰语前,但应放在all,both,double,half,twice,three times等词之后,名词之前。如:All the students;both the women;double the amount we already have(现有数量的两倍);half the fruit;an area twice the size of Wales(两倍于威尔士大小的地区)。