The lost boys go/goes round the island

The lost boys go round the island.

This sentence is in Present Indefinite. We use Present Indefinite for common actions. We form Present Indefinite with the help of the suffix s or es. We add this suffix to the verb in the third person singular. The lost boys are in the third person plural. So we dont add the suffix to the verb.

Interrogative is formed with the help of the auxiliary verb to do.

Do the lost boys go round the island?

Negative is formed with the help of the auxiliary verb to do + not.

The lost boys dont go round the island.