1. suppose的基本意思是“猜想；以為；假定”，但在具體的語言環境中意義不止于此，其用法如下：

1) suppose + that 從句，表示“猜測；假定”。如：
I suppose that you are right. 我想你是對的。
You can suppose that A equals B. 你可以假定A等于B。

2) suppose +名詞 / 代詞 + to be...，表示“認為……是……”。如：
Many people suppose him to be over 50. 許多人認為他已經50多歲了。

3) suppose用于祈使句中，表示“讓……”。如：
Suppose we go for a swim. (= Let's go for a swim.) 讓我們去游泳吧。

2. be supposed to 的用法
用法1) be supposed to... 其中to是動詞不定式符號，不是介詞，其后要跟動詞原形。當be supposed
to... 的主語是“人” 時，意為“應該……”；“被期望……”，它可以用來表示勸告、建議、義務、責任等，相當于情態動詞should。如：
Everyone is supposed to wear a seat-belt in the car. 每個人在汽車里都應該系安全帶。
Teachers are supposed to treat all the students alike. 老師應該對所有的學生一視同仁。

用法2) 當be supposed to... 的主語是“物”時，它表示“本應；本該”，用于表示“某事本應該發生而沒有發生”。如：
The new laws are supposed to prevent crime. 這些新法令本應該起到防止犯罪的作用。
The train was supposed to arrive half an hour ago. 火車本應在半小時之前到達。

用法3) be supposed to后面接“have + 過去分詞”時，表示“本應該做某事而沒做”。如：
You are supposed to have handed in your homework by now. 現在你應該已經把作業交上來了。
He is supposed to have arrived an hour ago. 他應該一小時前就到了。

用法4). be supposed to... 的否定結構為be not supposed to...,它常用于口語中，意為“不被許可；不應當”。如：
She was not supposed to be angry about that. 她本不該為那件事而生氣的。
You are not supposed to smoke on the bus. 你不應該在公共汽車上吸煙。

3. take off 脫下；起飛；匆匆離開

He took off his raincoat and took out the key. 他脫下雨衣,拿出鑰匙。
The plane will take off soon. 飛機馬上就要起飛了。
The train will take off at 7 this evening.火車今晚7點鐘離開。

4. bring out 拿出;取出；把...帶到戶外；使出現;使暴露;闡明

A crisis brings out the best in her.
在緊急關頭看出了她的優秀品質。

【詞義辨析】bring on, bring in, bring out,

1) bring on: 使發生；引起；端上（飯菜）。
Tom often brings on meals and his brother, Jim picks up the dishes after meals.
湯姆常常端上飯菜，（而）他弟弟吉姆飯后收拾碗碟。
The sudden cold weather brought on his cold again.天氣突然變冷，使他再次感冒。

2) bring in: 引來；引進；吸收。
His new business brings in 1，000 dollars.他的新生意使他賺了一千美元。
We also brought in some words from English.我們也從英語中吸收了一些詞匯。

3) bring out: 取出；說出；闡明；出版。
He brought out his gun and pointed at me.他掏出槍來指著我。
Bring out the meaning more clearly.請把意思講清楚些。
They have brought out a set of children's books.他們出版了一套兒童讀物。