Ratan is my brother. (a) He is not an irregular student. (Affirmative) (b) He is the best boy in the class. (Negative) (c) He wants to be a good teacher in future. (Interrogative). For this reason he works very hard. (d) He learns his lessons properly. (Past Indefinite) (e) All the students will be sincere to their study. (Optative)