Alguém pode me ajudar por favor?????

Primeiro escreva uma frase negativa. Em seguida reescreva a frase afirmativa usando a informação entre parénteses.

a) The teacher was teaching the students. (correct the tests)

b) I was skating on the lake. (swim in it)

c) You were opening the door. (close the window)

d) We were going to school. (travel to Paris)​