MUST - Obligation that comes from the speaker. The speaker thinks it is necessary., HAVE TO - External obligation. Another person thinks it's necessary. Law, rules, regulations, instructions., MUSTN'T - Strong prohibition. You can't do something., DON'T HAVE TO - No obligation. You don't need to do something, but you can do it if you want., NEEDN'T/DON'T NEED TO - To give someone permission NOT to do something. , DIDN'T NEED TO - It wasn't necessary and I did not do it., NEEDN'T HAVE + III - It wasn't necessary, but I did it anyway., BE ALLOWED TO - Express permission or possibility., BE ABLE TO - Do something because the situation provides this opportunity. , CAN - Expresses ability (physical), capacity and possibility, SHOULD - To give advice or opinion about what we think is right or wrong., SHOULDN'T - You'd better not do something., OUGHT TO - Similar to should. More formal and is less common., COULD - Past form of "can". To express very formal and polite request., MAY/MIGHT - Indicates a not so polite request (informal).,

Modal verbs. Understanding grammar

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