Resposta:
1)Henry and I were studying in a big school in the city
2) I was running in the park now.
3) Betty was leaving the office alone at this moment.
4) My mother was washing the house now.
5) July and William were eating apples for lunch.
Explicação:
I, he, she it = was + ing e o restante da frase;
you, we, you, they = were + ing e o restante da frase