A subject may take more than one verb.
I sat right down and cut my toenails.
Compounding is the process of joining similar parts. Joining two separate verbs to go with one subject results in a compound verb. The words that can join verbs are: and, but, yet, or, nor. These words are conjunctions.
Population growth will slow down and may stabilize by the year 2110.
Sometimes the conjunctions work in partnership with other words, such as:
either. . . or
neither. . . nor
both . . . and
not only . . . but also
One study not only predicts a steady 10.5 billion total population for several decades, but also describes a new distribution of people throughout the world.
When more than two verbs are compounded, the conjunction may appear between only the last two, while the others are separated by commas.
In contrast to families in the Third World, families in the industrialized nations bear fewer children, move more frequently, and feel less bound to their home communities.