Obligations/External rules/, Companies have to pay 20 percent corporate tax in the UK., I have to get to work early tomorrow. There's a meeting at 9 o'clock., I must watch this film. This is my homework., Obligations/Internal/For myself, I must get to work early every day. It's when I get my best work done., You must watch this film! It is so good., Suggestion/Advice, If you ask me, we should catch the earlier train., Should I call the supplier if they haven't replied to my email?, We shouldn't leave the air-con on when we leave the office. It's a waste of energy., Not Allowed!!, We mustn't lose market share to our competitors., Staff mustn't talk about company strategy in public., Passengers mustn't use mobile phones during take-off., Not Required/Not needed, You don't have to wear smart clothes but clean clothes are essential., I don't have to work tomorrow. It's a public holiday..

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