If you don't want to sound impolite, or cause embarrassment or distress of any kind to the person you're talking to, you should learn to use tactful and tentative forms in your English.
如果你不想听起来不礼貌，或对与你谈话的人造成任何形式的尴尬或窘迫，你应该学会在你的英语中使用委婉试探性的话语。
You should make good use of your spare time to practice English.
你应该充分利用空余时间操练英语。
Please use English to define a particular thing you are familiar with. You should include functions and examples apart from class and characteristics of it in the definition.
请使用英语来定义一个特定的事情你都熟悉。你应该包括函数和例子除了在定义类和特征。
If you are learning English, you should use an English dictionary.
如果你在学习英语，你应该使用英语字典。
You should carry in your pocket a pen and a blank piece of paper which you could use them to doodle English words while you are waiting for a bus, a class or a meal in a restaurant.
第十二，你应该把一支笔和一些白纸放在口袋里，这样在你等公交，上课前或在餐厅等餐时可以拿出来随意拼写单词。
Billy: : Don't you fret. I will give you some hints on the business English you should use.
比利：别担心，对于你该用的的商务英语，我会给你一些提示。
And you should be good at English and art and be able to use computer skillfully.
你要英文、美术都好，并且能熟练使用电脑。
You should study hard to get yourself assimiliated with the English environment and use exams as a kind of yardsticks only rather than final target.
应该仅把考试当成一个检验自己成绩的标准而不是最终目标。
You should try to use everyday English.
你应尽量使用日常英语。
Billy: Don't you fret. I will give you some hints on the Business English you should use.
比利：别担心，对于你该用的商务英语，我会给你一些提示。
Billy: Don't you fret. I will give you some hints on the Business English you should use.
比利：别担心，对于你该用的商务英语，我会给你一些提示。
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