This is Spanish mass hope you can help please

In which of the following sentences is the capitalized word or phrase used or placed incorrectly? a. ¿quién lo conoce á él? b. elena conoce a los dos. c. roberto conoce para maría y por alberto. d. ¿quién conoce a maría?

Which sentence contains a completed action? when i was a child there was a fair in my town every year. i won a prize at the fair last year.

What does it mean to conjugate a verb? how do you conjugate verbs in spanish?