Active to passive voice

1.They often invite me to their place.

They punished the boy for that

He will forget it very soon.

They had done everything before we came.

They are examining the last student there.

Somebody has invited her to the party.

They were constructing some new Metro lines.

You can take the book home.

The boy must tell her the truth.

They sell envelopes at the post office.

They spoke English at the conference.

The baby will break the toy soon.

They had already sent for the doctor.

They use chemicals to make sugar white

She has looked after the children.

The teacher was writing some words.

He could cook dinner later

You must learn this lesson very well.

They have discovered a new medicine

People spend a lot of money on fast food.