A2used to avoid repeating a phrase mentioned earlier: "I hope they stay together." "I hope so too.""Do you think he's upset?" "I don't think so."James is coming tonight, or so he said.B2used to say that a situation mentioned earlier is correct or true: "Is it true that we're not getting a pay increase this year?" "I'm afraid so.""Anthony and Mia don't get on very well." "Is that so?""The forecast says it might rain." "If so, we'll have the party inside."Expressions used to describe situations›used to say that a fact that has just been stated is certainly true: "My eyes are slightly different colours." "So they are.""That's her brother - he looks like James Dean." "So he does."Very and extremeComplete and wholeIntensifying expressions›used instead of repeating an adjective that has already been mentioned: She's quite reasonable to work with - more so than I was led to believe.He's quite bright - well, certainly more so than his brother.›USchild's wordused, especially by children, to argue against a negative statement: "You didn't even see the movie." "I did so!"Very and extremeComplete and wholeIntensifying expressionsto do soC1to act in the way mentioned: Parents must take responsibility for their children. Failure to do so could mean a fine or a jail sentence.