They/ These/ Those are + 名词复数.
Are they/ These/ Those + 名词复数?
Yes, they are./ No, they aren't.
How many + 名词复数 + are there + 介词词组? 有多少.?
How many + 名词复数 + can you see/ do you have? 你能看见/你有多少.?
How much is it? 它多少钱?
How much are they? 它们多少钱?
Can I help you? 你要买点什么?