10 sentences with the modal verbs
obs: todas as frases devem conter na forma negativa e positiva
Soluções para a tarefa
Tyler can dance very well.
Tyler can't dance very well.
Thieves may steal wallets.
Thieves may not steal wallets.
Kids should play outside more often.
Kids shouldn't play outside more often.
Too much medicine might kill you.
Too much medicine might not kill you.
Smoking must be prohibited.
Smoking mustn't be prohibited.
Swimming at the lake could be nice.
Swimming at the lake couldn't be nice.
They ought to have ordered a pizza.
They oughtn't to have ordered a pizza.
I'd better be going now.
I'd better not be going now.
*Nothing need change on your paper.
*You needn't change a thing on your paper.
You've got to try this new soda.
You haven't go to try this new soda.
Sobre o semi modal need: ele é geralmente usado na negativa para indicar a não obrigatoriedade ou não necessarieda de algo, então fica meio difícil usá-lo em frases afirmativa e negativa sem fazer algum tipo de alteração a fim de manter a semântica.