think of, think about, think over用法
1、think about 和 think of 这两个短语表示“考虑”、“对……有某种看法”时，可以互换。例如： 
Don't think of（about）me any more．不要再考虑我。 
They're thinking about（of）buying a new car．他们正在考虑买一辆新车。 
What do you think of（about）the film？你认为那部影片怎么样？ 
 
2、 think of表示打算、想出、关心等意义，一般不与think about 互换。 
Helen，are you thinking of marrying Tom？海伦，你打算和汤姆结婚吗？ 
Who thought of the idea？谁想出的这个主意？ 
Lei Feng was always thinking of others．雷锋总是为别人着想。 
I can't think of his name．我想不起他的名字。 
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3、think about表示经常思考、研究的意思，一般不和think of换用。
I often thought about what you said．我常常想到你说过的话。 
I'll think about your suggestion，and give you an answer tomorrow．我要考虑一下你的建议，明天给你答复。 
 
4、think over 意为“仔细考虑”。
Think over，and you'll find a way．仔细考虑一下，你就会有办法的。 
We need several days to think this matter over．我们需要几天的时间把这件事情仔细考虑一下。

e- (ef- \ ex- \exo- ）= out evade流逸\ export出口\ exclude排除 \ ex-soldier退伍军人\ ex-husband前夫\ exobiology外太空生物学 
extra- = outside extracurricular课外的 \ extraordinary格外的 
fore- = before forehead前额\ foreground前景 
in-(im- \ em- \en- ) = in embed嵌入\ embody体现\ enroll入籍\ import进口\ immigrate移民 \ indoor室内 \ intake吸纳 
inter- = between interfere干涉\ interlude插曲 
intra- = inside intramural在城市或者建筑内的 \ intranet内部网络 （区别Internet互联网） 
out- = out outdoor户外\ outflow流出 
para (pari-)- = around, near parasite寄生虫\ pericardial心脏周围的 
per- = through perceive 
post- = after postwar战后\ posterity后代 
pre- = before prewar战前 \ prehistory史前 
pro- = forward protrude伸出 \ progress前进 
re- = back recall回忆 \ retell复述 
retro- = back retrogress退步 \ retrograde倒退 
sub- = under subway地铁\ submarine海面以下的 
super- = above superstructure上层建筑 \superficial表面的 
sur- = over surface表面 \ surmount攀登上山 
trans- = across transatlantic横越大西洋的 \ transport运输 
under- = under underground地下的 \underwear内衣 
ultra- = beyond ultraviolet紫外线

最常见的名词后缀有： 
表示具体的人、物的后缀：-an (- ian , - ean ,-ane ) \ -ant \ -ar \ -ary \ -er \ -ician \ -ist \ -ite \ -or \ -ory \ -ics \ -ilogy等。 
表示抽象的动作情况的后缀： -acity : capacity -acy: fallacy - al (-ial , -eal ) : denial \ refusal -ence ( - ance , -ency , -ancy ): influence \ acceptance \ - ion: union \ creation -ism : heroism -ment (- men) : excitement \ monument - mony : matrimony \ -ness : coldness \ goodness - or :error -sis: analysis \ -tude : longitude \ multitude -ty : novelty -ure: pressure -y : victory 
最常见的动词后缀有： 
-ate：differentiate \ maturate \ 
-en：sharpen \ darken \ 
-fy：simplify \ beautify \classify 
-ise(-ize)：criticize \ fertilize \ modernize

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