词语辨析及单词用法

4．be able to, can与could的辨析 A. be able to“能够，会”，用来强调经过努力
后最终“能够做某事了”，它有多种时态变化，还 可与某些情态动词如：must, may等连用。如：
* He hasn’t been able to answer my letter since
* The boy has nothing / something to do with
tຫໍສະໝຸດ Baidue matter.
* Do you have anything to do with him? * Doesn’t this thing have too much with him？
8．表示“不再”的几种英语表达法 表示“不再”的短语：no longer，not any more和 not any longer。如： * I haven’t heard from her any more. = I haven’t heard from her any longer. = I have no longer heard from her.
he takes part in the special kind of work.
* I’ll be able to see you after work next week. * After he put a lot of lamps in front of the large mirror, the doctor was soon able to operate on his
* This invention took him a long time.
*The discovery of radium has helped many people
who have got cancer.
6．always 与不同时态连用 be always doing表示经常反复发生的动作，常表 示说话人的某种感情，比如赞扬、批评、厌烦等， 带有说话人的一种感情色彩。 always和一般现在时连用，则只表示一种事实， 没有感情色彩。如： * “I’m sorry for being late again, sir.” “Again?
注意：三个词都表示“快”，但在具体用法上 很不相同。如：
* He quickly got up and went on running.
* Trees and grass grow very fast in spring.
* They’ll be back soon. “快点”是Be quick，而不说Be fast。 Come on.表示说话人单纯催促对方“快点”。
* Please try to come. b. try one’s best to do sth. “尽某人的最大努力做 某事”。如： * The parents believe that the police will try their
best to find their child.
* I’ll try my best to win the race.
mother.
B. can也表示“能够，会”，只强调本身所具 备的能力，只有两种时态；其次，can不能再与其 它的情态动词连用；第三，can还可以用来表示 “请求”，而be able to 则不能。如：
* A blind man can’t tell colours.
* At that time he couldn’t understand what his
初三第一学期第九讲
II. 选用适当的疑问词填空 which, what, when, how, where 1. Nobody told me ________ to do next. 2. She showed me ________ to use a computer. 3. I want to buy some Christmas presents. Please tell me ________ to buy such things. 4. There are two dresses and I can’t decide ________ to choose. 5. There is a film in our school this evening but I don't know ________ to start.
You are always coming late.”
* You are always thinking of others.
* The boy is always telling lies.
*The girl is always leaving her books everywhere.
7．have nothing to do with … 表 示 “ 与 …… 无 关 ” ， nothing 可 以 用 something 或anything等代替。如：
C. try (n.)表示“尝试”，经常用于have a try, want a try中。如：
* He didn’t really want to do it. He just wanted a try.
* I had three tries and failed each time. * I don’t know whether I can mend the clock, but I’ll have a try at it. * Give the new CD player a try and see if you like it.
B. 与try构成的短语 a. try to do sth. “努力（试图或设法）做某事”如 ： * I’m trying to work out a maths problem.
* I’ll try to do well in all subjects if I can enter
this high school.
father did because he was too young. C. could除了是can的过去时以外，用来表示
“请求”时表示语气更客气、更委婉。如： * Could you tell me who will be able to pass the
exam?
* Could you lend me some money?
* She will not come to my home for clothes any more. = She will not come to my home for clothes any
longer. = She will no longer come to my home for clothes.
3. quickly, fast与soon的辨析 quickly着重指某动作“迅速”地发生或完成， 具有即刻行动，毫不耽搁的意思。 fast着重指某动作进行速度的“快”，没有即刻 发生和迅速完成的意思。 soon表示“不久”或“很快”的意思时，是指 在不久的未来将发生某个动作或出现某个情况， 也可以指过去很短时间之后发生了某个动作或产 生的某个情况。
2. try的用法 A. try (v.)表示“试一试，尝试”，后可跟宾语 也可不跟宾语。如：
* Why not try the medicine?
* You can try the pen. You’ll like it.
* I’m afraid I can’t do it well, but I’ll try.
c. try out “试验；试用；试试”。如： * Excuse me, may I try out this ball-point pen, please? * Try out the new medicine for a year and we’ll see how well it works. * We won’t know how the plan works until we have tried it out. d. try on “试穿”。如： * When I saw her yesterday, she was trying on a new coat. * Do you like this pair of shoes? Why not try them on?
5．invent与discover的辨析 discover指发现世界上早已存在，只是未被人们知
道或看到的东西；而invent是指通过想象或实验，发 明以前不存在的东西。如：
* Columbus discovered America.
* Madam Curie discovered radium.
*Do you know who invented the telephone?
Alexander Bell.
注意下面的词性变化：
invent (v.) 发明
discover (v.) 发现
inventor (n.) 发明者 discoverer (n.) 发现者
invention (n.) 发明 discovery (n.) 发现
如：
* Edison was a great American inventor.