In this sentence, the subject is Matt, which is singular ... Normally in the past tense, you do not need to worry about subject-verb agreement because you can conjugate most regular past tense verbs ...

To form the perfect tense, you need the correct person of the verb haber (to have) plus the past participle. The past participle is a word that often ends in ‘-ed’ in English like ‘played ...

There is a misconception that all verbs in a paragraph should be in the same tense. The choice of the appropriate verb tense depends on context and meaning.

One’s tense ... past tense due to what they have done was in the past. It has been debated whether one should use active or passive voice. The scientific journal Nature states that one should use ...