'The teacher warned the children' vs 'The teacher warn the children'

[Maggie U.]

English Language Tests, Intermediate level

ESL/EFL Test #178 "Reported commands: reported speech", question 7

"Don't play with matches. They're very dangerous." -- The teacher ......... the children not to play with matches.

(a) ordered
(b) asked
(c) warned
(d) begged

English Language Tests, Intermediate level

ESL/EFL Test #178 "Reported commands: reported speech", answer 7

"Don't play with matches. They're very dangerous." -- The teacher warned the children not to play with matches.

Correct answer: (c) warned
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why ­don't we use the verb warn?

Maggie U.

[Mister Micawber]

We do. See above.
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Native English teacher at Mister Micawber's