There is a grammar mistake in each of the following sentences. find it and correct it.
1. what time have you to start work?
2. i must to go now. bye-bye.
3. we no allowed to wear shorts at the university
4. we no can do what we want.
5. you mustn't smoking in here. it's against the rules.
6. i mustn't do the washing and ironing because my mother does it for me.
7. my mother have to work hard 6 days a week.
What time do you have to start to work?
I must go now. Bye-bye.
We aren't allowed to wear shorts at the University.
We can't do what we want.
You mustn't smoke here. It's against the rules.
I don't have to do the washing and ironing because my mother does it for me.
My mother has to work hard six days a week.