Spanish Prepositions 24/25

1. What is the preposition in this sentence and what does it mean? "Voy a la playa"

1. What does "a" mean?

2. What is the preposition in this sentence? "Estoy en el restaurante"

2. What does "en" mean?

3. What is the preposition in this sentence? "Corremos por las montañas"

4. What does "por" the mean?

5. What is the preposition in this sentence? "Visito Paris para practicar Frances"

5. What does "para" mean?

6. What is the preposition in this sentence? "El libro está sobre la mesa"

6. What does "sobre" the mean?