Question

I don't know the time of his arrival

Answer 1

Question :

I don't know the time of his arrival.

( Turn into complex sentence )

Answer :

I don't know when he will arrive.

_____________________

#_100% correct✌

Answer 2

${\fbox{\huge\sf{\pink{An}\purple{sW}\green{eR}}}}$

I don't know when he will arrive .