Hjælp til Engelsk retefejl

Hejsa, har fået udlevet nået grammatik til engelsk hvor man skal finde fejl i sætningerne neden for. Der er kun 1 fejl i hver sætning, og man skl forklare bagefter hvorfor at det er en felj, nogen som kan hjælpe? :)

1. My friend does nor drink or smoke even though many other teenager s does.
2. His half-Sisters Mary, whom lives in London, is not nearly as famous as he is.
3. I'm sorry to say this, but i cannot take this accusations serious.
4. He watching TV when she turned off the power
5. Peter had only loved one women in his life, but he knew that other men were often unfaithful.
6. Neither of the two arrogants boys spoke very fluently English.