A: Filter the water through a filter
The easiest way that I could remember those things are past means its behind you, present is what your doing now, and imperfect tense is kinda like the past one. I hope that I help you.
1. Salades
2. légume
3. Soupes
4. Boissons
5. Viandes
6. Fromages
7.Fruits
8. Poissons