Hi, I have trouble with that too, but I'm afraid every learner has trouble with that. And it's something that doesn't have an easy explanation, because I don't think there's an easy rule of thumb to remember, and I think not everyone pronounces those words the same way... I personally pay attention to the stress in single words, not to the stress in sentences, not much.
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CalifJim a palm-planted COURTyard ('palm-planted' is an adjective)
a glass