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I have to arrange as a sequence some details about operations an ATM user will do to take cash.

Which of the following is or are grammatical?

  1. The first time the user pushes the button, if the number he entered is not valid, then...
  2. At the first time the user... (as the above)
  3. For the first time...(as the above)

I would be inclined to choose the first... Am I right?

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closed as not a real question by RegDwigнt Nov 10 '12 at 19:14

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Where is the rest of the sentence? Without further context, two and three are not even an option, but I can think of context that could justify for. You might also be interested in our sister site specifically for English language learners. Thank you. – RegDwigнt Nov 10 '12 at 19:14
@RegDwighт: I edited my post. I suppose that now it's more clear. – A_nto2 Nov 10 '12 at 20:49