To show an action that started in the past and that is going on in the? present, use thea. future perfect? tense, so they will have studied for several hours. b. present perfect? tense, so they have been studying for several hours. c. past perfect? tense, so they had studied for several hours. d. present? tense, so they are studying for several hours.

the correct answer would be:  

a. adverb phrase

the correct answer is the following.

one of the groups i belong to is the boy scouts. this is a problem-solving group because it has tasks that we need to solve in order to other people in different activities such as the rescue of lost pets, or elder people in need.

the other group i belong to is kids pro environment, and is an information-sharing group that tries to create conscience about the risks and problems that generate pollution in our cities. we share information to other students and parents on the importance of keep our communities clean and our skies clear.  

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