1.We use you to talk about people in general including the speaker and the hearer:?
我們通常用you來(lái)談?wù)撊藗儯ㄕf(shuō)話者和聽者：

You can buy this book anywhere > This book is on sale everywhere.

You can’t park here > Parking is not allowed here.

They don’t let you smoke in here > No smoking here.

2.We use they or them to talk about people in general:?
我們通常也用they或者them來(lái)談?wù)撊藗儯?/div>

They serve good food here.

Ask them for a cheaper ticket.

3.… especially about the government and the authorities:
特別是關(guān)于政府或者權(quán)威

They don’t let you smoke in here.

They are going to increase taxes.

They are building a new motorway.

They say it’s going to rain tomorrow.