... của Gerund):1. Subject for a verb : (Làm chủ ngữ cho động từ ) .EX: Swimming is good for your health. Smoking is not good for your health. 2. Object for some verbs (Làm tân ngữ cho một số ... plan, prepare, pretend, promise, refuse, seem, struggle, threaten, volunteer,wait, want, wish. 4. Verbs followed by a pro(noun) + an infinitive: advise, allow, ask, arrange, beg, cause, challenge,...