Some nouns can be considered either singular or plural, depending on whether the speaker is referring to them as a one group or individually.

The committee has not made a decision yet. The committee have not made a decision yet. The team is posing for a photograph. The team are signing autographs.

(It will submit one conclusion as a group.) They are still arguing among themselves.) (as a group) (as individuals)

Be careful when using collective nouns with pronouns.

• The Jones family is having a reunion this Sunday. It meets every summer.
• The Jones family are going home on Monday. They all live in different states.