переделай по образцу his dog is black. - his dog isn`t black
1) Tom`s clock is big. -
2) Ann`s cockerel can swim. -
3) Jim has got a frog. -
4) His cat is grey. -
5) Hens have god clocks. -

А здесь вот так пойдет: 2) Ann`s cockerel cannot swim.?

А здесь вот так пойдет: 2) Ann`s cockerel cannot swim.?

Ну можно написать can't , можно can not. Смысл не менется

Tom's clock isn't big. Ann's cockerel can't swim. Jim hasn't got a frog. His cat isn't grey. Hens have not got clocks

1.Tom's clock isn't big 2.Ann's cockerel can't swim 3.Jim hasn't got a frog 4.His cat isn't grey 5.Hens haven't got clocks