Example sentence - Their travel plans were tentative until they
could pay for the flights.
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The word 'tentative' is an adjective that is either pre-modifying or attributive, as in 'a tentative suggestion', or predicative, as in 'he is tentative'.
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I can give you several sentences.
That is just a tentative agreement.
The party is tentative; I'll call later when we have firmer plans.