1.   A proposition can not change its truth-value without in effect becoming a different proposition.

2.   Biological filters are a different proposition.

3.   His uncle Laban is a different proposition altogether.

4.   Hot water is a different proposition.

5.   Malcolm Harris was a slightly different proposition.

6.   Sentences can therefore express different propositions on different occasions of use.

7.   He uses the indeterminacy of language to convey, through a single utterance, two very different propositions to the audience.