You use these short forms very often, which is fine, but do remember that it is quite unusual to see them in written correspondence (unless you are leaving a note for someone you know well). Just like Norwegian we tend to hear the short form mostly in speech. If you do use the short form in written English, then it should only be after a personal pronoun (I, you, he, she, it, we, they) and never after a noun (guide, bus etc). Just to be on the safe side, I would always write the long form - so, NOT “we'll” BUT “we will” etc.

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