[ たくさん/すこし ] V
たくさん(a lot) and すこし(a little) are adverbs which describe the degree or amount/quantity of what is represented by V.
ジョンさんは ごはんを たくさん たべました。
John ate a lot of rice./John had a big meal.
ジョンさんは ごはんを すこし たべました。
John ate a little bit of rice./John had a light meal.