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2.3.2 Possessive Reversible Conclusions

Take the sentence: “John is the father of Pete.

From this sentence we conclude that: “Pete has a father (named John).”.

First of all, a conjugation of the verb “to have” is named (here below) a possessive verb, because it indicates the ownership of the generalization.

The rules which apply to the Possessive Reversible Conclusion are:

1. In the sentence, the generalization as well as the relation must be a proper noun. In making the conclusion these must be exchanged;
2. The sentence must include a prior term of the verb “to be ( am / is / are )”, which in the conclusion is to be replaced by a prior term of the possessive verb “to have”;
3. The sentence must have a singular specification with a noun. If, in the specification, a definite article is used, then it must be replaced by an indefinite article in the conclusion.

Now to apply the rules to the above mentioned sentence:

1. The generalization “John” and the relation “Pete” are proper nouns and are exchanged;
2. The verb “is” is replaced by the possessive verb “has”;
3. The singular specification “the father” contains a noun. The definite article “the” is replaced by the indefinite article “a”.

The result is: “Pete has a father (named John).”.