Spanish questions / pretérito perfecto

Question 1

1. Los estudiantes de biología…un peligroso experimento.

habéis realizado 

han realizado 

2. Lucas y Nicolás todavía no…su invento.

han patentado

hemos patentado

3. Yo…mi teléfono celular otra vez.

has perdido

he perdido

4. Jimena y yo todavía no…la conexión inalámbrica en casa.

hemos instalado

han instalado

5. Los científicos ya…diferentes especies de animales.

han clonado

habéis clonado

Question 2: Un reto tecnológico

Completa la conversación con el pretérito perfecto de los verbos entre paréntesis. 

CARMEN Hola, ¿qué haces? Te veo muy concentrado. 

GERARDO Me acabo de comprar este teléfono celular y creo que ya lo (1) (romper). 

CARMEN Déjame ver, yo también (2) (tener) problemas con el mío. ¿Estás seguro de que (3) (poner) la contraseña correcta? 

GERARDO Pues, no. Creo que la (4) (olvidar). 

CARMEN Sinceramente, creo que tú no te (5) (prepararse) para los avances del mundo moderno.

Question 3. Combinar 

Combina los elementos dados y forma oraciones completas que describan los eventos que ocurrieron. Sigue el modelo. 

Modelo:el Premio Nobel / de física / hacer / grandes avances / para la ciencia 

El Premio Nobel de física ha hecho grandes avances para la ciencia. 

1. los astrónomos / detectar / nueva / constelación 

2. un biólogo ecuatoriano / descubrir / cinco / especies nuevas / de árboles 

3. los matemáticos / resolver / el problema / de geometría 

4. el transbordador espacial / volver / de su última misión 

5. los estudiantes / ver / una estrella fugaz

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