1. Angel abre la puerta del laboratorio.
Angel is a name and can be replaced with "He" so you should conjugate abrir in the el/ella/usted format. Puerta is a feminine noun, and laboratorio is a masculine noun. The sentence reads "Angel opens the door to the laboratory".
2. Mi cunada y yo decidimos leer los libros interesantes.
Mi cunada y you is a collective group that includes yourself so it can be replaced with "We"; conjugate decidir in the nosotros(as) format. Libros is a masculine noun, and since there are multiple, pluralize interesante. The sentence reads "My sister-in-law and I decide to read the interesting books".
3. Ustedes aprenden hablar el espanol.
Conjugate aprender in the ellos/ellas/ustedes format. The sentence reads "You all learn to speak Spanish".
4. Yo corro en el estadio los domingos.
Conjugate correr in the yo format. Estadio is a masculine noun and so is domingos. The sentence reads "I run in the stadium on Sundays".
5. Tu asistes al clase de la historia frances.
Conjugate asistir in the tu format. Clase is a masculine noun, and historia is feminine. The sentence reads "You attend the French history class."
Hope this helps!!
*****Some of these answers require accents. I am unsure of how to put them in, but they are written in the original sentences, just be sure to include them in your answer :)*****
