around / round (aráund / ráund) - alrededor de, por
as of / as from (as ov / as from) - a partir de
as for / as to (as for / as tchú) - en cuanto a, con respecto a
at (at) - en, a
because of (bicós ov) - debido a
before (bifór) - antes de, delante de

around / round (aráund / ráund) - alrededor de, por

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• Mary should arrive around four o'clock.
  Mary debería llegar alrededor de las cuatro.
• Is there any book store around here?
  ¿Hay alguna librería por aquí?
• He is wearing a chain around his neck.
  El está usando una cadena alrededor de su cuello.
• We saw several sharks swimming round the boat.
  Vimos varios tiburones nadando alrededor del bote.

as of / as from (as ov / as from) - a partir de

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• They will be living here as from Saturday.
  Ellos estarán viviendo aquí a partir del sábado.
• As of Monday, I will follow a new diet.
  A partir del lunes, seguiré una nueva dieta.
• As from July, the store will be open till ten.
  A partir de julio, la tienda estará abierta hasta las diez.
• The supermarket will be closed for five days as of tomorrow.
  El supermercado estará cerrado por cinco días a partir de mañana.

as for / as to (as for / as tchú) - en cuanto a, con respecto a

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• No claim was made as to the accuracy of the editorial.
  No se hizo ningún reclamo en cuanto a la exactitud del editorial.
• The police are unsure as to the exact time of the murder.
  La policía no está segura con respecto a la hora exacta del asesinato.
• She was uncertain as to which dress she was going to put on.
  Ella estaba indecisa con respecto a qué vestido se iba a poner.
• As for your book, I think it will become a bestseller.
  En cuanto a tu libro, creo que se convertirá en un bestseller.

at (at) - en, a

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• We stayed at home because it was raining.
  Nos quedamos en casa porque estaba lloviendo.
• We usually get up at 8 o'clock in the morning.
  Generalmente nos levantamos a las ocho de la mañana.
• The museum is at the end of this street.
  El museo está al final de esta calle.
• The soldiers fired at the enemy.
  Los soldados le dispararon al enemigo.

because of (bicós ov) - debido a

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• The game was cancelled because of the rain.
  El partido fue cancelado debido a la lluvia.
• We arrived very late because of the traffic jam.
  LLegamos muy tarde debido al embotellamiento de tránsito.
• She didn't have any friends because of her shyness.
  Ella no tenía amigos debido a su timidez.
• Bill couldn't become a pilot because of his bad eyesight.
  Bill no pudo convertirse en piloto debido a su vista deficiente.

before (bifór) - antes de, delante de

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• They will be here before the weekend.
  Ellos estarán aquí antes del fin de semana.
• The engineers will complete the project before March.
  Los ingenieros completarán el proyecto antes de marzo.
• The orator stood before the audience and started his speech.
  El orador se paró delante del auditorio y comenzó su discurso.
• Your name is before mine on the list.
  Tu nombre está antes del mío en la lista.