25/2/2016 ENGLISH PAGE Have to englishpage.com Home > Modal Verb Tutorial > Have to Have To f t g+ p "Have to" is used to express certainty, necessity, and obligation Examples: This answer has to be correct. certainty The soup has to be stirred continuously to prevent burning. necessity They have to leave early. obligation Using "Have to" in Present, Past, and Future "Have to" behaves quite irregularly in the past and the future. Study the chart below to learn how "have to" behaves in different contexts Positive Forms Negative Forms Also 1. = Present 2. = Past 3. = 1. = Present 2. = Past 3. = Future use: 1. That has to be Jerry. They 1. SHIFT TO "MUST" must, said he was tall with bright red That must not be Jerry. They said have hair he has blond hair, not red hair got 2. That has to have been the 2. SHIFT TO "MUST" have to right restaurant. There were no That must not have been the right certainty other restaurants on the street restaurant. I guess there was Use Future 3. NONE to another one around there somewhere 3. NONE 1. She has to read four books 1. She doesn't have to read for this literature class "Grapes of Wrath." It's optional http://www.englishpage.com/modals/haveto.html must 1/3 25/2/2016 ENGLISH PAGE Have to 2. She had to finish the first book before the midterm have to 3. She will have to finish the necessity other books before the final exam reading for extra credit 2. She didn't have to write a critique of "The Scarlet Letter." She had to give a presentation to her class 3. She won't have to take any other literature classes. American Literature 101 is the only required course REMEMBER: "Do not have to" vs. "Must not" "Do not have to" suggests that someone is not required to do something. "Must not" suggests that you are prohibited from doing something Examples: You must not eat that. It is forbidden, it is not allowed You don't have to eat that. You can if you want to, but it is not necessary EXERCISES AND RELATED TOPICS Modal Exercise 1 can, could, have to, must, might and should Modal Exercise 2 have to and must Modal Exercise 7 modal verb forms Modal Verb Final Test complete review Copyright © 2016 Englishpage.com, All Rights Reserved Contact us | Privacy Policy | Advertise with us Your personal online English school. Learn English at Englishpage.com! Weekly Lesson Grammar Book Vocabulary Verb Tenses Conditionals Modals Gerunds / Infinitives Articles Prepositions Minitutorials Irregular Verbs Reading Room Listening Lounge Games English Forums English Schools English · Foreign Dictionaries English ·English Dictionaries Irregular Verb Dictionary Phrasal Verb Dictionary http://www.englishpage.com/modals/haveto.html 2/3