Do you say once or one time?
I have always heard at school that you have to say once end twice but when i hear people speaking in english they use also one time and two time. There are difference between them? One is more correct than the other? Thanks all

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Ciao Manfredi, I don't understand your question. Can you try to be a bit clearer about which phrase you do not understand?

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Its the same, twice is two times, just like once,  is one time

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Example: I have been in London (twice or two times???)