Преобразуйте в косвенную речь he asked us: "is it all right if i open the window? " i said to my friend: "i am afraid i can't come out for a sea with you".

1) He asked us if it was all right if he opened the window

2) I said to my friend I was afraid I couldn't come out for a sea with him

Преобразуйте в косвенную речь  

He asked us if it was all right if he opened the window.

I said to my friend that I was afraid I couldn't come out for a sea with him.