Original: Some Muslims do not perform prayer.
Form: particular negative.
Tempting converse: Some non-prayers are not Muslims.
The original gives no information that guarantees the second statement. We are classifying the argument form, not making a judgment about any named individual.
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Source exercise: Some Muslims do not pray
Simple Conversion of Propositions: Definition, Method and Rules
Original: Some Muslims do not perform prayer.
Form: particular negative.
Tempting converse: Some non-prayers are not Muslims.
The original gives no information that guarantees the second statement. We are classifying the argument form, not making a judgment about any named individual.