Question

Which sentence is not grammatically correct? 1.May i go to my friend's house next Friday? 2. You must not smoke in a plane. 3.can we visit you on Tuesday? 4.You have to stop at the red traffic light.

thank you so much=)​

Answer 1

2)May i go to my friend's house next Friday?

3) . You must not smoke in a plane?

4)You have to stop at the red traffic light.