To show that we are sure something isn't true., To recommend something., To talk about a specific ability in the past., For actions that we did regularly in the past but we don't do now., To say that something is not necessary. , To ask for advice., To talk about obligation., To show that there is no obligation or necessity., To talk about something that is not allowed., It was possible for something to happen in the past but it didn't. , We are sure something didn't happen in the past. , Something was the right thing to do, but we didn't do it. , We are sure something happened in the past. , It wasn't necessary to do something but we did., To make suggestions..

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