As Brian said, "taken" and "given" are verbs in *perfect tense*. In English, you have different ways to talk about the past. For example: Past indicates that something happened in the past: I took the bus to school. (Then I sat down in the classroom and talked to my friend...) I ate a cake made of onions. (Because I had one in the fridge.) Perfect tense is used to stress that something has *already* happened. I have taken the bus to school. (But I didn't like it, going by bike is much more fun!) I have eaten a cake made of onions. (On a holiday in France.) I hope this helps.

'taken' and 'given' are used in the perfect tenses. For example, I have taken... you have given... The past tense of take is took, and the pas tense of give is gave.