polska-engelska översättning av zaklinać się

assert
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He would often assert that there was life on other planets.to assert ones authoritySalman Rushdie has asserted his right to be identified as the author of this work.
assure
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I assure you that the program will work smoothly when we demonstrate it to the client.He assured of his commitment to her happiness.

guarantee
us
Can you give me a guarantee that he will be fit for the match?The cooker comes with a five-year guarantee.The long sunny days guarantee a good crop.
swear
us