Answer:
The correct answer for the blank space for this sentence is: Estabas
Step-by-step explanation:
The traslation in English for this sentence is: Last night you ____ in the beach with your friends.
now for TÚ that means YOU the correct form of the verb BE that means ESTAR is ESTABAS because is in past tense.
so the complete sentence will be:
Anoche tú estabas en la playa con tus amigos. which means: Last night you were in the beach with your friends.