Hi teachers ,

Please help me know which of these sentences are correct :

a/Tom is a head taller than Mary

b/Tom is taller than Mary by a head

c/This room is 2 meters longer than that one.

d/This room is longer than that one by 2 meters

Thanks in advance
All of them look fine to me, just need periods at the end.
Thank you VORPA . I understand nowEmotion: smile