Memory Modals of obligation/necessity (D)Versión en línea Let's work on some modals! (should, can, need, have to, must) por Tami Sotelo Obligation, not as strong. Necessity. Strong. Prohibition, strong. Obligation, strong. Optional, absolutely no obligation or phohibition of any type. Optional, not necessary but not wrong to do or have. Suggestion. Not a prohibition, but it is better not to do it. Suggestion. Not an obligation, but it is best to do as adviced.
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