1
I love mashed potatoes.
Sign 'I', 'love', 'mashed', and then sign 'potatoes' by placing your bent 'V' hand on your non-dominant fist, circling it, and returning to the same spot.
2
Do you want a baked potato?
Point to the person for 'you', sign 'want', 'bake', and finish with the 'potato' sign, keeping your non-dominant fist steady while the dominant hand circles. Remember to raise your eyebrows for the yes/no question.
3
We need to buy potatoes.
Sign 'we', 'need', 'buy', and then form your dominant hand into a bent 'V' to stand on and circle above your non-dominant fist for 'potatoes'.