When only after, only if, only in this way etc. Are placed at the beginning of the sentence for rhetorical effect, the subject and auxiliary are inverted: Only after lunch can you play.

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Or i can do only so much in this time. The question asks for a general answer but gives only one special context. In general, only and but only are not substitutable. *they but only work that way occasionally. In only when , there is a sense of urgency, a slightly more 'involved' writing. It was only when is by comparision more 'relaxed' writing, more like someone is recounting something to someone.

In only when , there is a sense of urgency, a slightly more 'involved' writing. It was only when is by comparision more 'relaxed' writing, more like someone is recounting something to someone.