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M.A.K Halliday was a famous scholar formulating systemics. To my humble opinion, he was rather theoretical, though something that stayed was his scales, for instance, the probability scale for modals:
It will rain (+pole)
It can't rain (-pole)
within these poles, place modal verbs such as could, might, can, may...
These scales help students to understand meaning connections within similar vocabulary groups, which is something difficult to teach.
Another scale: permission
Can I ?
Could I ?
May I ?
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