2. I have to go early today! [my boss wants to see me Use an ][alternative modal used in speech to this] to replace have to
I have got to [I've gotta
3. I must phone my friend in Britain. It's been too long ! Replace must with a modal of obligation used in speech
I've got to I've gotta
4. You shouldn't make jokes with Chavs! [Replace the modal verb with a synonym modal verb with the same degree of suggestion]
you ought not /you oughtn't