They have been to Canada.

Present Perfect Tense

This sentence uses the Present Perfect tense, which is formed with 'have/has' + past participle. It indicates an action that happened at an unspecified time in the past but has relevance to the present, or an action that started in the past and continues to the present. In this case, it means the person has visited Canada at some point in their life.

Explanation: The Present Perfect is used to talk about experiences or events that have happened in the past and have a connection to the present. 'Been to' is the past participle of 'go', used here to indicate a visit.