Demonstrative can mean different things. The main thing that it means is openly showing feelings, but it can also mean demonstrating something as true or real.
showed
protest
Did you mean "demonstrated"? If so, demonstrated means showed. "He showed them how to make omelets." / "He demonstrated to them how to make omelets." infinitive: to demonstrate
exampled , or shown
She demonstrated her competence in handling challenging situations by effectively leading the team to success.
showed presented displayed illustrated explained portrayed
I have demonstrated convincingly that I have the ability to answer many questions.
The word demonstrate is a verb. The past tense is demonstrated.
Show is another word for demonstrate. Additional synonyms include display and exhibit.
The coach demonstrated to the team how to hold a bat correctly.
Q.E.D is Latin for "quod erat demonstrandum" which translates into either "which was to be demonstrated" or "thus it is demonstrated.
She advised him to exercise prudence with his finances, urging him to save rather than spend impulsively.
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The word demonstrate is a verb. The past tense is demonstrated.