lucas21c which one is okay All of them. In the second group you are emphasizing "no matter when it may be that you arrive, it doesn't matter when", so you would probably hear those with some stress on the relevant syllables: when EV er, AN y time. CJ
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lucas21cwhich one is okayAll of them.
lucas21cHow about "Please call me any time you arrive"? If there is no 'at' in front of 'any time', is it still right?Yup! You can leave out "at".
lucas21cWe can arrange a meeting in any place where you are convenient?As often happens, there are mistakes in the part of the sentence that you're not even asking about.
lucas21cWhich one is right between them?2 is right.
lucas21c1. Please call me (at) any time when you arrive2. You can ask for my help (at) any time when you need it.No.