The children are acting impatient/impatiently.
Correct response and more importantly Why??
			
									
									
						Grammar question
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The verb act can be linking or action.  When functioning as an action verb — like when the children are putting on a production and have to act — the adverb would be used.  In this context, impatiently doesn't seem to fit though.  When functioning as a linking verb — to convey how the children are behaving or putting on airs — adjectives, like sad or impatient, are correct.