• Limitation: Rules should show clearly what the limits are on the use of a given form.
For example, to say simply that we use will to talk about the future is of little use to the learner since it
doesn't show how will is different from other ways of talking about the future (e.g. going to).
• Clarity: Rules should be clear. Lack of clarity is often caused by ambiguity or obscure terminology.
For example: 'Use will for spontaneous decisions; use going to for premeditated decisions.' To which a
student responded, 'All my decisions are premeditated'.
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