Разложите карточки по группам: "I must" и "I mustn't".

Группа "I must" (Я должен)

• drink dirty water
• come home late
• feed animals at the zoo
• speak the truth
• drink cold milk
• play on the road
• wash fruit before eating
• skate on the road
• be late for school

Группа "I mustn't" (Я не должен)

• be careful
• use the phone in class
• do my homework
• be noisy
• play with matches
• come on time
• break trees
• talk in the library
• make much noise
• tell lies
• take care of my pets

Ответ: Задания распределены по двум группам: "I must" (Я должен) и "I mustn't" (Я не должен) согласно их смысловой нагрузке.