Ejercicios de inglés 3: present perfect vs simple past, will y going to y reported speech
Actualizado el 4 min de lectura 29 ejercicios resueltos
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Ejercicios de repaso de la unidad de Saberes y pensamiento científico del curso de inglés de tercero: los proyectos Matter, Everywhere and Everywhen, I Guess, Then I Make Decisions, Chemical Reactions y Reliable Information (páginas 36 a 49, 98 a 107 y 154 a 173 del libro de la SEP). Resuelve cada actividad y revisa tus respuestas al momento.
Present perfect o simple past
1. Escribe el verbo en present perfect o simple past
a) We (do) a conductivity test last Monday.
b) Scientists (discover) many new elements since 1900.
c) you ever (mix) vinegar and baking soda?
d) I (not see) the experiment yesterday.
e) This year, our class (make) three posters.
Ver respuestas
a) We did (do) a conductivity test last Monday.
b) Scientists have discovered (discover) many new elements since 1900.
c) Have you ever mixed (mix) vinegar and baking soda?
d) I didn’t see (not see) the experiment yesterday.
e) This year, our class has made (make) three posters.
Conectores de secuencia y causa
2. Elige el conector correcto
Ver respuestas
First, put on your gloves. Then, measure the water.
The ice melted because of the heat.
Salt water conducts electricity; therefore, the led turned on.
Mix the ingredients. After that, wait ten minutes.
Will o going to
3. ¿Will o going to?
Ver respuestas
Look at the sky! It is going to rain.
“The test tube broke.” “Don’t worry, I will get another one.”
We are going to visit the blood bank on Friday. We already have an appointment.
4. Relaciona cada palabra con su traducción
Ver respuestas
| beaker | vaso de precipitados |
| flask | matraz |
| test tube | tubo de ensayo |
| blood type | tipo de sangre |
| donor | donador |
| average | promedio |
| misleading | engañoso |
Reported commands y reported speech
5. Pasa las órdenes a reported commands
a) “Wear your lab coat,” the teacher said to me. →
b) “Don’t touch the chemicals,” she said to us. →
c) “Clean the beakers,” the assistant said to them. →
Ver respuestas
a) “Wear your lab coat,” the teacher said to me. → The teacher told me to wear my lab coat.
b) “Don’t touch the chemicals,” she said to us. → She told us not to touch the chemicals.
c) “Clean the beakers,” the assistant said to them. → The assistant told them to clean the beakers.
6. Pasa las oraciones a reported speech
a) “I donate blood every year,” my uncle said. →
b) “We are doing a survey,” the students said. →
c) “I have checked the data,” Ana said. →
d) “The results will be ready tomorrow,” the doctor said. →
Ver respuestas
a) “I donate blood every year,” my uncle said. → My uncle said that he donated blood every year.
b) “We are doing a survey,” the students said. → The students said that they were doing a survey.
c) “I have checked the data,” Ana said. → Ana said that she had checked the data.
d) “The results will be ready tomorrow,” the doctor said. → The doctor said that the results would be ready the next day.
Preguntas abiertas
7. ¿Cuál es la diferencia entre «I lost my keys» e «I have lost my keys»?
I lost my keys habla de algo terminado en el pasado (quizá ya las encontré). I have lost my keys tiene efecto en el presente: todavía no las tengo.
8. Escribe en inglés las instrucciones del volcán de bicarbonato usando first, then y finally.
Modelo: First, make a cone with clay. Then, mix vinegar with baking soda in a small container. Finally, pour the mixture into the volcano and watch it erupt.
9. Un anuncio dice que el sueldo es «de $3,000 a $20,000». ¿Qué dato necesitarías para saber si es confiable?
La distribución: cuántos empleados ganan cada cantidad (o al menos la mediana o la moda de los sueldos). Con solo el rango no se puede saber el sueldo típico.
Si tuviste dudas, repasa las clases de esta unidad:
Matter: present perfect y simple past
I Guess, Then I Make Decisions: will y going to
Chemical Reactions: reported commands
Reliable Information: reported speech
Referencias
- Secretaría de Educación Pública (2025). Uérakua anapu uantakua. Projects and Readings. Third Grade. Secondary. SEP, pp. 36-49, 98-107 y 154-173.
- Murphy, R. (2019). English Grammar in Use (5.ª ed.). Cambridge University Press.
