#english_language 

## Interchangeable cases
We use should or ought to in the following cases:
- to talk about advice or recommendations:
	> You should stop doing that
- to talk about responsibilities or duties:
	> I should visit them more often
- to talk about an event that is probable now or will be in the future
	> They should be there ^b80185

## Only should
- To talk about recommendations from outside authorities:
	> The manual says the computer should be ...
-   To give advice with "I" (possible to use would):
	> I would/should stop doing that, if I were you

## Alternatives
We can use (be) supposed to talk about weak obligation or to report that something is believed to be true.

We use **must** when we talk about deriving logical conclusions from something. ^8bdd5e