---Do you know when he ______ back tomorrow?

---Sorry, I don't. When he ______ back, I'll tell you.

1. A.
   comes; comes
2. B.
   comes; will come
3. C.
   will come; comes
4. D.
   will come; will come

—Do you know when he        back tomorrow?
—Sorry, I don’t know. When he        back, I will tell you.

---Do you know _____ back tomorrow?

-  --Sorry, I don’t know. When he _____ back, I’ll tell you.

A. when does he come, comes    B. when he comes, will come

C. when he will come, comes     D. when will he come, will come