Question

use appropriate modal auxiliary
it is nessary for all of us to avoid unhygienic food​

Answer 1

Answer:

It is advisable for you to keep your surroundings clean. (ii) It is necessary for all of us to avoid unhygienic food.

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Answer 2

(i) You should keep your surroundings clean. (ii) All of us must avoid unhygienic food. The underlined words 'should' and 'must' are modal verbs or modal auxiliarie