8 предложений
+ - ?
с модальными глаголами
Need
should
must
have to

Need
+I need a doctor.
-I needn't a doctor
? Need me a doctor?

Should
+We should think about wild life more ofen.
-We shouldn't think about wild life more ofen
? Should we think about wild life more ofen.

Must
+You must leave this city tomorrow
-You mustn't leave this city tomorrow
? Must you leave this city tomorrow
 
Have to
+they have to read 4 books
- They dont have to read 4 books
? Do they have to read 4 books?