First lets do the exercises in the following links:
- Modal Exercise 4
- Modal Exercise 3
- don't have to, doesn't have to - Exercise
- http://www.autoenglish.org/modalverbs/gr.mustnt.i.htm
- http://www.autoenglish.org/modalverbs/ModalsObligation.htm
- http://learnenglish.britishcouncil.org/es/grammar-exercises/modals-1
- http://www.englishclub.com/grammar/verbs-modals-have-to-must-not-quiz.htm
Write a sentence in English about each of the following signs to explain the safety regulations in a factory
Now write 5 sentences about safety in a restaurant kitchen.

