Our first grammar section this year was MODALITY. We have been taught in a special way, it was the thinking approach. First of all, you make hypothesis about several modal verbs.
This is an example of our first "try":


Then we got to another more specific table by analyzing exercises and accumulating examples. This is an example of classwork on modal verbs.


As a result I came up to an algorithm of choosing the wight modal verb.
This is my own way of understanding differences in modal verbs, but it helps. As a result, most exercises are correct! Hope it will help you : )


Here are some exercises, which I mostly fail:


Extra exercises on modal verbs,which are really good,you can find here :

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