1.通常放在动词前面。
例如:
He often goes swimming in summer.他夏天常去游泳。
That boy always comes later.那个男孩总是迟到。
It seldom rains in winter here.这里冬天很少下雨。
He never tells a lie.他从不说谎。
2.放在连系动词be或can,may,must will等助动词和情态动词后面。
例如:
A modern mirror is usually a looking glass.现代的镜子一般是玻璃镜。
It is sometimes hot and sometimes cold.天气忽冷忽热。
She is seldom ill.她很少生病。
I have never met him before.以前我从没有见过他。
3.sometimes可以放在句首,也可以放在句中或句末。
例如:
Sometimes the bird sings./The bird sometimes sings./The bird sings sometimes.这鸟不时啼叫。
4.often可以放在句末,表示练习语气。
例如:
I haven't been there very often.我并不常去那儿。
5.seldom,never可以放在句首,表示练习语气,但句子要用倒装语序。
例如:
Seldom have I met him in the street.我很少在街上碰见他。
Never has our great motherland been so prosperous as it is today.我们伟大的祖国从来没有像今天这样繁荣昌盛。
6.ever多用于疑问、否定及条件句中。
例如:
Have you ever been to Beijing?你曾到过北京吗?
If you ever come to Guangzhou,be sure to let us know.如果你到广州来,务请通知我们。
7. ever放在疑问词后面,起强调作用。
例如:
Who ever can it be?到底是谁?
What ever do you mean?你究竟什么意思?
Where ever did you lose it?你究竟在哪里遗失的?