1, accepted by pu, but with problems noted earlier (it violates sense and pu's rules)
2. not a sentence (no 'li', 'e' in a noun phrase, only one word after 'pi')
3. says "He named Matu something"
4. needs 'li' after 'ona'. otherwise on course.
1. Okay, though it only says "much food", not "too much food" and that you are fat, not that you become fat. Minor and context covered.
2. says "Mother tried to eat me" want 'mama meli li pali e moku tawa mi'
3. Right (context to get "carry" rather than merely "possess).
I took the water to the market. (I can imagine some other possibilities, like "I am going to barter water", but they involve dubious changes -- 'tawa' as a modal, in this case.)