Question

D) i'm waiting for my friend.How long...? E) i'm writing a letter.How long...?ПОМОГИТЕ ПЛИЗЗ

Answer 1

D) How long have you been waiting for your friend?
E) How long have you been writing the letter?

Answer 2

Have yo been waiting for your friend?
how long have you been writing a letter

Answer 3

D) "I'm waiting for my friend. How long have you been waiting?" E) "I'm writing a letter. How long have you been writing it?"