Conyac で依頼された翻訳結果を公開

Please let me know when you feel my English expression is unnatural or there is much better expression.
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Basically, to express thanks to a person for his/her action to have done just before, just say “Arigatou Gozaimasu”. To express thanks to a person for his/her action done before, just say “something (an act) arigatou gozaimashita”.

It may be better to think using expression “arigatou gozaimasu” right before ending the communication with a person speaking to. For example, say “arigatou gozaimasu” just before a customer leaves a convenience store and right before hanging up a telephone.

However, Japanese do not use that expression with such strict distinction. There are many occasions in which swapping those expression does not matter to understand what a speaker wants to express.