2. Have to / Don’t have to• We use have to when we mean «this isnecessary» or you are «obliged to».Example:All children have to go to school in this country.• We use don’t have to when we mean «this is notnecessary» or «you are not obliged».Example:Three-year-old don’t have to go to school.
3. Have to / don’t have toSUBJECT EXPRESSION VERB IN BASE FORM COMPLETMENTIhave todon’t have tostudy for the test.You pay attention in class.We practice our English.They work every day.Hehas todoesn’t have tofinish the project today.She take care of the children.It be good. had to go to school
4. Questions with have toDO / DOES SUBJECT EXPRESSION VERB BASE FORM COMPLEMENTDo Iyouwetheyhavetodo thehomework?Does hesheitclean the class?Did Iyouwetheyhesheitread the book?
5. Can / Can’t• We use can when we mean you «areable to» or «permitted»• We use it for «permission»• We use it to express capacity to dosomething.• We use can’t means «you are notpermitted» or that «you don’t havecapacity to do»
6. Can / can’tAFFIRMATIVE NEGATIVE QUESTIONI can swim. I can’t swim. Can you swim?You can stay athome.You can’t stay athome.Can I stay athome?SHORT ANSWERSYes, I can. No, I can’t
7. Must / mustn’t• We use must when we mean thatsomething is very important andyou are obliged to do it.• We use mustn’t when we meanthat something is «notpermitted»
8. Must / mustn’tAFFIRMATIVE NEGATIVE SHORTANSWERSYou must cleanyour room.You mustn’tswim withoutwarming up. Yes, I must.No, I mustn’t.He must respecthis friends.She mustn’t goout late.