For-> duration of an action/ a situation: three years, two weeks, a long time, ages, a while.
Since-> time when de action started: last August, he was 21, the spring.
Gerund: avoid, can´t sand, consider, deny, discuss, dislike, don´t mind, enjoy, finish, give up, imagine, miss, recommend, risk, stop, suggest, keep. V+ing
Infinitive: agree, appear, arrange, choose, decide, demand, expect, fail, hope, learn, manage, mean, plan, prepare, pretend, promise, refuse, tend, want, would like, forget, try, regret, starting. To+ V