Correct this sentence and explain why it is wrong: My father have twelve son.

The sentence "My father has twelve sons." is grammatically correct and makes sense. The original sentence is incorrect because "have" is the present tense of the verb "to have," which is used to indicate possession or relationship. In this sentence, the subject "My father" is the one who has twelve sons, so the correct verb form is "has." Additionally, "son" is singular, so it should be pluralized to "sons" to match the number "twelve."