B1used to say that something has ended: Well, that's it, we've finished - we can go home now.That's it! I'm not putting up with any more of her rudeness.B2used to say that something is correct: You switch the computer on at the back. That's it.
One of the best ways (perhaps the best way) to improve your English is to learn how words go together in phrases, idioms, or other patterns such as verb/noun or adjective/noun pairs (often called ‘collocations’). This blog looks at some useful phrases and collocations connected with the subject of decisions, something we