用法辨析：

（1）“Why not+动词原形+…？”（干嘛不……？）是简略句，完全形式是：Why don't you +动词原形+…？如：Why not go and have a look？（干嘛不去看看？）/Why not try it once again？（为什么不再试试？）

（2） seem（好象）的用法：记住几个结构：①sb./sth.+seem+（to be+）形容词+…；②sb./sth.+seem+like +…；③sb/sth+seem+to（do）；④It seems that+从句。如：He seemed（to be） very happy when he was called by the headmaster.（被校长叫到名字时他好象很开心）/It seems that nobody else could do such a foolish thing except Jim.（除了吉姆好象没有什么人会做出如此愚蠢的事情来）

（3） be afraid（害怕）的用法：记住几个结构：①be afraid of sth；be afraid of（doing）；②be afraid to（do）；③be afraid that+从句。如：She is a little afraid of snakes.（她有点怕蛇）/Don't be so afraid to stay at home alone at night.（别害怕晚上一个人在家）/I'm afraid that somebody will take his place because of his serious mistakes.（恐怕有人要取代他了，因为他犯了那么大的错误）

（4） be sorry（抱歉）的用法：记住几个结构：①be sorry for（sth）；②be sorry for（doing sth）；③be sorry to（do）；④be sorry that+从句。如：I am very sorry for keeping you waiting so long.（不好意思让你久等了）I am sorry to trouble you.（对不起，麻烦你了）/I am sorry（that） he isn't here at the moment.（恐怕他现在不在）

（5） be sure（确信）的用法：记住几个结构： ①be sure of（sth）；②be sure to（do）；③be sure that+从句。如：She told me many times that she was sure to come.（她给我讲过多次她一定会来的）/Are you sure of your answer？Maybe it's wrong.（你对你的答案有把握吗？也许是错的。）/I am sure that Dad will help me with the job.（我确信爸爸会帮着我做这件事情的）

（6） make 与do的用法：一般情况下表示进行活动或者做工作用do，表示创造建构某事物用make. 如：I don't know what to do.（我不知道该干什么）/I'm not going to do any work.（我不准备做什么）/My father and I once made a boat.（我和我爸曾经做过一只船）

此外还要记住一些固定说法：do good/harm/business/one's best/a favour……

make a decision/an effort/a mistake/a noise/a phone call/money/war/the bed/sure，……