Безличное местоимение в английском

Impersonal pronouns

We use you to talk about people in general including the speaker and the hearer:

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

We use they or them to talk about people in general:

They serve good food here.
Ask them for a cheaper ticket.

… especially about the government and the authorities:

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.

We use one (singular) and ones (plural) to avoid unnecessary repetition.

See those two girls? Helen is the tall one and Jane is the short one.
Which is your car, the red one or the blue one?
My trousers are torn. I need some new ones.
See those two girls? Helen is the one on the left.
Let’s look at the photographs. The ones you took in Paris.

We often use them after Which ...in questions:

You can borrow a book. Which one do you want?
There are lots of books here. Which ones are yours?

You и one используются в безличном смысле, из них one более книжное, а you разговорное.

You use ONE to make statements about people in general which also apply to themselves. [FORMAL]
If one looks at the longer run, a lot of positive things are happening...
Where does one go from there?...

In spoken English and informal written English, YOU is sometimes used to refer to people in general.
`I didn't want to go into nursing,' she said, `but my dad told me to, and in those days you did what you were told.'

Есть еще наблюдение, что one скорее британский выбор.

Часто с помощью it.
It's cold. It rains и т. д и т. п.
В случае "говорят, что" (they say) - да, додумывать, так же, как и в вашем. Но это несложно совсем.

Кроме "they" есть ещё "one". 'One might call you an idiot.'