Choose the correct option1 I have / has already finished my homework?

Choose the correct option 1 I have / has already finished my homework. 2 my son have / has just started the university. 3 the black family have / has gone to the seaside. 4 dad haven't / hasn't watered the plants. 5 have / has sam ever been to the USA? 6 our English teachers have / has never ridden a horse. 7 Ann, frank and jim have / has bought a new house. 8 have / has you taken the dog for a walk? 9 the weather have / has been terrible since yesterday. 10 my little sister have / has just stopped crying. Por favor ayuda.