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1. think/ think/about/ think of (1) think 单独使用时表示思考， 接that 宾语从句时意为认为，觉得。 I am thinking how to work out the problem. I think she is a good student. 当宾语从句含有否定概念时，通常形式上否定think ，但意义上却是否定宾语从句。 I dont think he can come. I dont think it will be windy. (2)think about 可接一个名词，动词-ing 形式或由疑问词引导的不定式或宾语从句，意思是考虑。 I have thought about it for a long time. Please think about how to tell her the bad news. (3)think of 表示认为， 一般用于疑问句中，与what 连用。 What do you think of the TV play? = How do you like the TV play? 2. big/ large/ great 上述形容词都表示大，但侧重点及程度不同。 (1) big指具体事物的大小，强调比正常形体的标准大，既可用在普通场合，也可用在正式场合。它可用来指人的身材高大或长大了，还可表示伟大，重要之意。如： Can you lift up this big stone? On the last day I made a big decision. | 
