1. People speak English and french in Canada.
English and french are spoken  in Canada.
2. They will visit Lan tomorrow.
Lan will be visited tomorrow
3. We are studying Maths now.
Maths is being studied now
4. My grandpa planted these trees ten years ago.
these trees were planted by My grandpa  ten years ago.
5. You should write the letter in English.
the letter should be written  in English.
6. They have just opened a new restaurant on Le Hoan street.
a new restaurant has just opened on Le Hoan street.
7. I don't clean my room on weekdays.
my room isn't cleaned  on weekdays.