This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Kernel sentence has a subject, simple verb, and possibly a direct object. The verb is always active (an action verb); helping verbs "to have" allowed; there are no adjectives or adverbs; it is always positive ("no" "not" prohibited) 

The bear ate berries. (ate is action verb; the bear ate; the bear ate what? berries) 
A baby cried. (cried is action verb; a baby cried) 

I've never heard of these before. See source for more details and some more examples.