1. think/ think/about/ think of
(1) think 單獨使用時表示思考， 接that 賓語從句時意爲認爲，覺得。
I am thinking how to work out the problem.
I think she is a good student.
當賓語從句含有否定概念時，通常形式上否定think ，但意義上卻是否定賓語從句。
I dont think he can come.
I dont think it will be windy.
(2)think about 可接一個名詞，動詞-ing 形式或由疑問詞引導的不定式或賓語從句，意思是考慮。
I have thought about it for a long time.
Please think about how to tell her the bad news.
(3)think of 表示認爲， 一般用於疑問句中，與what 連用。
What do you think of the TV play? = How do you like the TV play?
2. big/ large/ great
上述形容詞都表示大，但側重點及程度不同。
(1) big指具體事物的大小，強調比正常形體的標準大，既可用在普通場合，也可用在正式場合。它可用來指人的`身材高大或長大了，還可表示偉大，重要之意。如：
Can you lift up this big stone?
On the last day I made a big decision.
(2) large特別強調遠遠超過標準的大，指體積、面積、容積、數量之大。
