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Only when is the green light on vehicles may cross the train track.

Only when the green light is on vehicles may cross the train track.

which of these is grammatically correct to use, as I have learnt the word only at the beginning of the sentence followed by auxiliary verb(inversion), but it sounds a bit odd to me.

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  • I've delted my answer to your question. Commented Aug 1, 2016 at 21:48

1 Answer 1

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The inversion required is of vehicles and may:

Only when the green light is on may vehicles cross the train track.

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