Question

1- some singers does sing very well
2- alice can go to the parte she is ill
3- william cands dive in the sea
4- toma don't do karate​

Answer 1

1- Some singers SING very well.
2- Alice CAN’T go to the parte, she is ill.
3- William CAN’T/CAN dive in the sea. (Puede ir cualquiera de las dos)
4- Tomas DOESN’T do karate.