Subject-Verb Agreement

Front

A fossil (contain, contains) animal or plant remains.

Back

contains

Front

Fossils are studied in many ways.

Back

are

Front

The scientist and her assistant (handle, handles) fossils carefully.

Back

handle

Front

Either the scientist or her assistants (handle, handles) fossils carefully.

Back

handle

Front

Chemicals or soap used for cleaning:

Back

is

Front

Small hand tools and power tools also help.

Back

help

Front

The scientist (wants, want) to know the age of a fossil.

Back

wants

Front

She (uses, use) an x-ray and radioactive dating methods.

Back

uses

Front

Neither x-ray nor radioactive dating methods the exact age of the fossil.

Back

tell

Front

Instead they (provides, provide) approximate ages.

Back

provide