Rewrite these sentences without changing the meaning: Nam is taller than Nga. Nga is taller than Hoa

Rewrite these sentences without changing the meaning
1, Nam is taller than Nga . Nga is taller than Hoa
Nam is the ..........................................................
2, I last ate two days ago
I haven't......................................................................
3, Mrs. Phuong hasn't gone out for a walk for two years
Is is.............................................................................
4, how long is it since you used this car?
when