Practice.
Answer first, then read the explanation. Don't skip it — that's the whole point.
Hoy yo _____ en la oficina a las siete para terminar el informe. (entrar)
Today I went into the office at seven to finish the report.
¿_____ tú alguna vez en una mezquita? (entrar)
Have you ever been inside a mosque?
Alguien _____ en mi coche; la puerta está forzada. (entrar)
Someone has broken into my car; the door has been forced.
Esta semana nosotros _____ tarde a clase tres veces. (entrar)
This week we've been late for class three times.
Este año _____ en el país más turistas que nunca. (entrar)
This year more tourists than ever have come into the country.
Yo nunca _____ en un casino. (entrar)
I've never been inside a casino.
¿Por qué _____ tú sin llamar? ¡Me has asustado! (entrar)
Why did you come in without knocking? You scared me!
Hoy me _____ un sueño horrible después de comer. (entrar)
Today I got terribly sleepy after lunch.
Hasta ahora nosotros solo _____ en dos de las cinco salas del museo. (entrar)
So far we've only been into two of the museum's five rooms.
Últimamente _____ ladrones en varias casas del barrio. (entrar)
Lately burglars have broken into several houses in the neighbourhood.
¿_____ vosotros ya en la nueva biblioteca? Es preciosa. (entrar)
Have you (all) been inside the new library yet? It's beautiful.
Esta mañana _____ en el mar por primera vez este verano. (entrar)
This morning I went into the sea for the first time this summer.
¿Alguien _____ en la cocina? Falta un trozo de tarta. (entrar)
Has someone been in the kitchen? There's a piece of cake missing.
¿Cuántas veces _____ tú hoy en el despacho del jefe? (entrar)
How many times have you been into the boss's office today?
Not just a green check. A short paragraph telling you why.
No streaks, no points, no leaderboards. Just questions.
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