If the stem puts it that " A happens only when B happens", certainly we know that if A happens then B must happens. But I wonder here if B happens, must A happens? Take an example of the first sentence in PT18.S2.Q23, it says "Teachers are effective only when they help their students become independent learners." So according to it, if a teacher did help the students become independent learners, can we determine that the teacher is effective?
Beside I wonder is there any difference between the function of "only when" and "only if" in logical reasoning?
Can anyone here give his/her idea?
