What each person is doing differently, following the first given sentence is:
Luisa frecuentemente lee en su cuarto / <u><em>Ahora está leyendo en la </em></u><u><em>sala</em></u><u><em> frente al televisor</em></u><em>.</em>
Celso siempre se seca el pelo con una toalla/ <u><em>Ahora se lo seca con un </em></u><u><em>secador</em></u><u><em> de cabello</em></u><em>.</em>
Diego y yo nos entrenamos en el gimnasio/ <u><em>Ahora estamos entrenando en el </em></u><u><em>parque</em></u><em>.</em>
Generalmente mi hermana duerme en la cama/ <u><em>Ahora se queda dormida en </em></u><u><em>cualquier lugar</em></u><em>.</em>
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<h3><em>Sentences</em><em> about </em><em>different actions</em><em>.</em>
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Undoubtedly all people have some routines that they usually follow day after day, with slight changes on weekends, for which, in the given exercise, you should read the first sentence that <u><em>refers to the routine</em></u>, and then vary this routine a little, either with respect to the <u>place</u> where it is performed or the <u>environment</u>.