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The highs and lows of learning languages

I like to think I am an interested (0)  committed language learner. Well, that's the idea. (1)  it means is that, before travelling to another country, I spend time learning a little (2) of that country's language. To be honest, this time may be only (3) a small number of hours. So the result may be no more (4) than a few words and phrases.
However, if possible, I like to work out (5) how the equivalent of the verb 'be' works. I want to see (6)  or not the language has masculine and feminine. Do verbs change according (7) to the speaker? Is there a fixed order for words within a sentence?
Anyway, I believe the attempt is a good investment. Just being able to say things like 'hello', 'thank you', 'two coffees, please' and so (8)  – it all helps to make a positive impression. People appreciate the effort – (9) wouldn't they?
But (10)  is a difficulty in all this. Because I travel a lot for my work, I am constantly learning small quantities of different languages. Sadly, then, I speak (11)  language very well, and I tend to forget everything (12) asfast as I learn.