Question

1. I am happy to see you
I was happy to see you
2. Mary is not at school.
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3. This is my favourite book.
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4. It is a very interesting book
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5. They are good students.
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6. Tom is my best friend.
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7. We are good sportmen
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8.This dog is very friendly
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9. They are good students.
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10.I am not at the centre shooping
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Answer 1

Presente Pasado
Esta = is. Estaba = was

Son = are. Eran = were

Soy / estoy = am. Era / estuve = was

Ejemplo :

2. Mary was not at school
9. They were good students
10. I was not at the center shopping

Dato : shopping , así se escribe significa compras

Espero que te ayude (: