After listening to his advice，she had no more anxieties．听了他的建议，她不再有发愁的事了。
His friendships never last very long．他与别人的交情从来都不长久。
After many failures，they finally succeeded．经过多次失败之后，他们最后成功了。
4．某些抽象名词在某种场合是个体名词，它们的复数形式表示与该个体名词不同的意义，如：
youths（男青年、小伙子）， relations（亲属）， beauties（美人），necessities（必需品）等。例如：
Twenty youths attended the meeting yesterday.二十个男青年出席了昨天的会议。
All his poor relations came to spend their holidays at his home．他所有的穷亲戚都在他家过节。