还是(háishi)
The structure (是) ⋯ 还是 ⋯ is used to form an alternative question. If there is another verb used in the predicate, the first 是 often can be omitted.
Ex) 你是中国人,还是美国人?
他(是)喜欢跳舞,还是喜欢打球?
Ex) 你是中国人,还是美国人?
他(是)喜欢跳舞,还是喜欢打球?
The structure 还是⋯(吧) can be used to signify a selection after considering two or more options. Sometimes in making such as decision one is forced to give up one's preference. This structure could be translated "had better."
Ex) A: 我的车有问题。怎么办?
B: 我们还是在家看电视吧。
Ex) A: 我的车有问题。怎么办?
B: 我们还是在家看电视吧。