Brush up your grammar.modal verbs equivalents. we often use must,have to and have got to in place of each ofther,but sometimes not.we tend to prefer must -when we refer to ourselves (with//we): i really must weed this garden. -with you to express urgency: you must phone home at once. -pressing invitations or advice: you must come and see us. you must repair that fence. we often use have to(or have got to)to refer to outside authority: i have(got) to play my road tax soon.
