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In only when , there is a sense of urgency, a slightly more involved writing. I can only do so much in this time. Are placed at the beginning of the sentence for rhetorical effect, the subject and auxiliary are … · the wording implies that only b matters, not c, d, e,. It was only when is by comparision more relaxed … I will help you prepare for the meeting only if you finish your report: Which is grammatically correct? Or i can do only so much in this time. If and only if used in the same way means the same thing, … · yes, the person would yell once you fell, but only if you fell. When only after, only if, only in this way etc.