1. (I think) I prefer (country life) (more than) (city life)
-> I think I prefer country life to city life. (more than -> to)
2. (The) picture (was painting) (by) Jane (lat year)
-> The picture was painting by Jane last year. (lat year -> last year)
3. (At the moment), I am (spending) my weekend (go to) (camping) with my friends
-> At the moment, I am spending my weekend to go camping with my friends. (go to -> to go)