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is it because strong forms of word are sound clusters?
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Hello, Ricefarmer Emotion: smile

I'm not sure I understand your question. According to whom shouldn't the strong forms of words be taught in isolation?
I did study them when I was a university student. I think we need to know both the weak and the strong forms and also when to use them.

What exactly do you mean by sound clusters here, pelase?

Miriam
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Ricefarmer, as miriam said, both strong and weak forms are taught on a need-to-know basis. I think any teacher should teach both forms because they are used in everyday speech. I usually teach these forms whenever a word appears. For example, can. As well as teaching the proper use in grammar, I also teach the two different pronunciations this verb has, depending on the situation in which it is used, by means of examples.
Is this what you wanted to know?