Weak Forms play an ingenious role in many important contrasts of meaning, including can vs. can't

0:00 Introduction
1:33 Homographs: that & that
3:23 have & have
4:53 there & there
6:00 two & to, four & for
7:52 strong forms: citation forms etc.
9:30 off & on
10:52 strong negative, weak positive
13:34 can & can't

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