1. 我不确定,但我认为这件事还应该多加讨论。I am not sure ,but I think this thing need to be more discussed.
2. 我不太肯定,但我记得期末考试是在下个周一早晨。I am not sure,but I remenber the end exam will be started next Monday morning.
3. 我不太确定,但我想我们可以跟老板再讲讲价。I am not sure ,but I think we can discuss the price with the boss.