he (know)the problem since she told.make into present perfect+-?

( + ) He has known the problem since she told.

( -) He hasn't known the problem since she told.

Semoga Bermanfaat!{^=^}
Makasih:D

----Jawaban----
- He has known the problem since she told him. (+)
- He hasn't known the problem since she told him. (-)
- Has he known the problem since she told him? (?)

SEMOGA BERMANFAAT ^_^
jadikan jawaban terbaik yahh ^_^