Question

4 You at school last Monday.
5 He………………fifteen years old.
6 Our houses………………very old.
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Answer 1

Supongo que es algo así como "verb to be", por lo que entiendo jajajaja, si es así, seria...

4. You were at school last Monday

5. He is fifteen years old

6. Our houses are  very old

Espero haberte ayudado :)