I'm absolutely sure - I've lived in Japan, and my wife is Japanese. 'gozaimasu' is a word you add to a sentence to make it (even) more polite. E.g. 'Arigatou' -

I'm absolutely sure - I've lived in Japan, and my wife is Japanese. 'gozaimasu' is a word you add to a sentence to make it (even) more polite. E.g. 'Arigatou' - thanks. 'Arigatou gozaimasu' 'Thank you very much' (or whatever way you want to think about it). Same with phrases for 'good morning' etc. As for the taxi driver phrase, it goes like this: Normally when you ask for something in Japanese you would use for example 'kudasai' (=> 'give me', to the extent that it can be translated). But the taxi driver is serving the customer, and then that word is out of the question. Instead he is thanking for being given, which is basically what 'itadakimasu' means. And that's why that word works as something you say just before eating, but also why it does not translate to "Let's eat!". And working through phrase after phrase in Duolingo with only that kind of translations just doesn't work very well. And then months of comments and questions from users where they take the translation literally and figure they can use the same word as a metaphor in Japanese, the way the English translation can be used as a metaphor in English.. sigh. You don't learn how the language works that way. It can work as a (small) supplement when learning the language with other better tools, but I will state that you can't learn Japanese through only Duolingo. While you can actually learn Italian that way.