Quizzes: Subject Verb Agreement 1

For the following questions, determine whether the verb should be singular (ending in -s) or plural (not ending in -s) in order to agree with its subject.

1) Jupiter, whose existence was recognized by astronomers of ancient times, (has/have) long been associated with the mythologies of many cultures.

 
2) While drivers throughout the United States are required to purchase automobile insurance, coverage levels often (varies/vary) depending on the driver's age and state of residence.

 
3) In contrast to many other Roman amphitheaters, which (was/were)located in outlying neighborhoods, the Colosseum was constructed in the city center.

 
4) Formed by ice particles mixed with smaller amounts of rocky debris and dust, the rings of Saturn (contains/contain) several gaps whose origins have not yet been fully explained.

 
5) Although there (is/are) millions of different types of viruses in existence, only about 5,000 of them have been conclusively identified by scientists.

 
6) In the eighteenth century, the first public library in the United States and the first fire department in the state of Pennsylvania (was/were) founded by Benjamin Franklin.

 
7) Tropical waves in the Atlantic basin frequently (develops/develop) from disturbances that begin in East Africa and drift over the continent into the Atlantic Ocean.

 
8) The wings of a butterfly are sophisticated collectors of solar energy because their elongated rectangular scales (overlaps/overlap) to create a structure resembling shingles on a roof.

 
9) Gravitation, best known as the force that (gives/give) weight to objects with mass, also causes objects to fall to the ground when dropped.

 
10) Researchers have hypothesized that whales sing by pumping air into pouches, which then (releases/release) vibrations into the surrounding water.