Which one is correct?
Which way of writing is right:
1)I keen on something / I am keen on something
2)One should cook at home to not to waste money / One should cook at home not to waste money
Thank you in advance!

Question

Which one is correct?
Which way of writing is right: 
1)I keen on something / I am keen on something 
2)One should cook at home to not to waste money / One should cook at home not to waste money 
Thank you in advance!

Answer

1) I am keen on (keen is an adjective)
2) cook at home not to waste money (because you shouldn’t repeat “to” like in the first variant)