to talk about a necessity, The average American eats 1,200 more calories a day than they need to consume., to talk about a lack of obligation, You don't have to get your protein from meat and fish – there is a lot in peanuts, for example., to talk about a moral obligation, You should eat breakfast – it's good for your health, speculate on a present situation, I think most meat eaters must know that their carbon footprint is bigger., to talk about a lack of necessity (in past), I knew I needn't have bought so much food., to talk about a possibility (in past), By buying less food, most people could have saved money and helped the environment., to talk about an obligation, We will have to produce more animal feed for everyone, to talk about a possibility (any tense), We will produce more animal feed for everyone to be able to eat meat..

MODALS C2.4

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