You may have noticed that there is no generic way to say yes or no in Chinese. The simplest way to answer a question with yes is to repeat the verb or adjective from the question.
你喜欢不喜欢狗?
(Nǐxǐhuānbu xǐhuān gǒu?) Do youlikedogs?
喜欢。
(Xǐhuān.) Yes.
她们忙吗?
(Tāmenmángma?) Are theybusy?
忙。
(Máng.) Yes.
To say no, add 不 before the repeated verb or adjective.
你要不要咖啡?
(Nǐyàobu yào kāfēi?) Do youwantcoffee?
不要。
(Bú yào.) No.
你去美国吗?
(Nǐqùměiguó ma?) Are yougoingto the US?
不去。
(Bú qù.) No.
在 (zài) for things that are happening right now
Add 在 before a verb to show that something is happening right now.
我的朋友在看书。
(Wǒ de péngyǒuzàikànshū.) My friend is reading a book.