1. suppose的基本意思是“猜想；以为；假定”，但在具体的语言环境中意义不止于此，其用法如下：

1) suppose + that 从句，表示“猜测；假定”。如：
I suppose that you are right. 我想你是对的。
You can suppose that A equals B. 你可以假定A等于B。

2) suppose +名词 / 代词 + to be...，表示“认为……是……”。如：
Many people suppose him to be over 50. 许多人认为他已经50多岁了。

3) suppose用于祈使句中，表示“让……”。如：
Suppose we go for a swim. (= Let's go for a swim.) 让我们去游泳吧。

2. be supposed to 的用法
用法1) be supposed to... 其中to是动词不定式符号，不是介词，其后要跟动词原形。当be supposed
to... 的主语是“人” 时，意为“应该……”；“被期望……”，它可以用来表示劝告、建议、义务、责任等，相当于情态动词should。如：
Everyone is supposed to wear a seat-belt in the car. 每个人在汽车里都应该系安全带。
Teachers are supposed to treat all the students alike. 老师应该对所有的学生一视同仁。

用法2) 当be supposed to... 的主语是“物”时，它表示“本应；本该”，用于表示“某事本应该发生而没有发生”。如：
The new laws are supposed to prevent crime. 这些新法令本应该起到防止犯罪的作用。
The train was supposed to arrive half an hour ago. 火车本应在半小时之前到达。

用法3) be supposed to后面接“have + 过去分词”时，表示“本应该做某事而没做”。如：
You are supposed to have handed in your homework by now. 现在你应该已经把作业交上来了。
He is supposed to have arrived an hour ago. 他应该一小时前就到了。

用法4). be supposed to... 的否定结构为be not supposed to...,它常用于口语中，意为“不被许可；不应当”。如：
She was not supposed to be angry about that. 她本不该为那件事而生气的。
You are not supposed to smoke on the bus. 你不应该在公共汽车上吸烟。

3. take off 脱下；起飞；匆匆离开

He took off his raincoat and took out the key. 他脱下雨衣,拿出钥匙。
The plane will take off soon. 飞机马上就要起飞了。
The train will take off at 7 this evening.火车今晚7点钟离开。

4. bring out 拿出;取出；把...带到户外；使出现;使暴露;阐明

A crisis brings out the best in her.
在紧急关头看出了她的优秀品质。

【词义辨析】bring on, bring in, bring out,

1) bring on: 使发生；引起；端上（饭菜）。
Tom often brings on meals and his brother, Jim picks up the dishes after meals.
汤姆常常端上饭菜，（而）他弟弟吉姆饭后收拾碗碟。
The sudden cold weather brought on his cold again.天气突然变冷，使他再次感冒。

2) bring in: 引来；引进；吸收。
His new business brings in 1，000 dollars.他的新生意使他赚了一千美元。
We also brought in some words from English.我们也从英语中吸收了一些词汇。

3) bring out: 取出；说出；阐明；出版。
He brought out his gun and pointed at me.他掏出枪来指着我。
Bring out the meaning more clearly.请把意思讲清楚些。
They have brought out a set of children's books.他们出版了一套儿童读物。