think up,think out,think over,think of.
think up,think out側(cè)重于思考的結(jié)果,即是否想出了辦法、計(jì)劃等；
think up主要表示“設(shè)想、構(gòu)思”之意；think out主要表示“仔細(xì)思考并研究出（計(jì)劃等）,或者想透問題”等,兩個(gè)短語均為動(dòng)副結(jié)構(gòu)；think over也為動(dòng)副結(jié)構(gòu),側(cè)重于思考,不涉及結(jié)果,表達(dá)“深思熟慮,仔細(xì)思考”之意；think of主要表示“考慮,關(guān)心,想起,對(duì)……有某種看法”之意,為動(dòng)介（動(dòng)詞十介詞）結(jié)構(gòu).表示看法、評(píng)價(jià)之時(shí),常用一些副詞來修飾,如think much／a lot／a great deal／highly／well／ill of…（對(duì)……評(píng)價(jià)高／好／不好）；若問評(píng)價(jià)如何,覺得怎樣,常用what…think of…；若表示“以為,認(rèn)為”時(shí),則用think of…as.e．g．
①I can’t think of his name.我想不起他的名字.
②You mustn’t think of him as being irresponsible.你不要以為他是一個(gè)不負(fù)責(zé)任的人.
③She gained confidence in herself as she thought the matter over．她好好想了想這件事,對(duì)自己有了信心.
④He put his whole heart into thinking up ways to improve the quality of heir Products．他把全部心思都用來想辦法提高產(chǎn)品質(zhì)量.
⑤His theory is so complicated that nobody can think it out．他的理論是那樣復(fù)雜,沒有一個(gè)人能把它搞清楚