White House pets often become almost as well known as their owners. linking verb
Become is a linking verb because it links the subject (White House pets) with its predicate (owners) while giving knowledge about the subject.
Linking verbs are sometimes represented as performing the function of an equal sign because they deliver the connection between the subject of a correction and a certain state.
Examples of connecting verbs include: to be, to become, and to seem. These three examples are always connecting verbs. In addition, you have a linking verb: to appear, to feel, to look, to smell, to communicate, and to taste.
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