Réponse:
Ex 57 :
1. Shouldn't
2. Need to
3. Should
4. Can
5. Must not
Ex 58 :
A. You mustn't get involved in this controversy.
B. You should take your students to the...
C. They should pay a tribute to Martin Luther King.
D. Can you answer a few questions about your...
E. You need to study African-American history at...
F. You must keep alive the memory...
En espérant t'avoir aidé ! :)