Subjects: Sentence Combining With Compound Subjects
A verb can take more than one subject.
The padlock and chain on his refrigerator door speak louder than words.
Compounding is the process of joining similar parts. Joining separate subjects to go with one verb results in a compound subject. The words that can join subjects are: and, but, yet, or, nor. These words are conjunctions.
Sugar and insulin are always changing their levels in human blood.
Sometimes these conjunctions work in partnership with other words:
either . . . or. . .
neither . . . nor . . .
both . . . and . . .
not only . . . but also . . .
Not only sweets but also starches may stimulate the pancreas to produce excess insulin, reducing the blood sugar level.
When more than two subjects are compounded, the conjunction may appear between only the last two, while the others are separated by commas.
Muffins, potatoes, and spaghetti are converted to sugar during digestion.
A brief spurt of energy after eating, a sudden attack of fatigue, and then sustained low spirits can follow eating orgies.