Final answer:
The irregular verb in the provided sentence is 'swim,' but it is not irregular in its present tense form. Irregular verbs like 'begin,' 'bring,' and 'go' change form in the past tense and past participle, without following the standard '-ed' pattern.
Step-by-step explanation:
The irregular verb in the sentence "We swim every morning." is 'swim.' However, this is a trick question because 'swim' is not irregular in the present tense; it becomes irregular when transformed into its past tense 'swam' and past participle 'swum.' In the sentence provided, 'swim' is correctly used in its base form to indicate a habitual action, which matches the subject 'we' to form proper subject-verb agreement. If we were to refer to the past tense, then option (b) 'swam' would demonstrate the verb's irregular form. Some examples of irregular verbs include begin/began/begun, bring/brought/brought, and go/went/gone. These verbs do not follow the typical pattern of adding '-ed' to create past tense forms. For example, 'begin' becomes 'began' in the past tense and 'begun' as the past participle.