Present simple TO BE. Inserire il verbo essere

I __ a student.

Fossil fuels ___ non renewable energies. They ___ polluting.

Luca works in a testing laboratory. He __ an engineer.

I love my sister. She __ so funny.

Radi and Sicuranza ___ in my class.

We ___ welder. We use the blowtorch.

You ___ my friend. You must help me!

You ___ sad today.

Renewable enegies ___ expensive.