Test Unit 1 (Present Simple)

1. The lab technician _______ (test) the samples every morning.

• is testing
• tested
• tests
• test

Answer explanation

El Present Simple se usa para hábitos o rutinas. "Tests" concuerda con "the lab technician" en tercera persona singular.

2. Where _______ (you work) in the hospital?

• are you work
• does you work
• do you work
• you work

Answer explanation

En preguntas en Present Simple con "you", se usa "do". La forma correcta es "do you work".

3. The doctor _______ (not see) patients after 5 p.m.

• doesn’t see
• don’t see
• is not seeing
• not sees

Answer explanation

En tercera persona singular negativa en Present Simple, usamos "doesn’t" seguido de la base del verbo: "doesn’t see".

4. Blood samples _______ (require) proper labeling.

• requiring
• requires
• require
• required

Answer explanation

"Blood samples" es plural, por lo que el verbo debe ir en su forma plural: "require".

5. What time _______ (the lab open) every day?

• lab opens
• does the lab open
• is the lab opening
• do the lab open

Answer explanation

Para preguntas en Present Simple con un sujeto en tercera persona singular, usamos "does" y la base del verbo: "does the lab open".

6. Nurses _______ (monitor) the patient's vital signs every hour.

• monitors
• monitor
• monitoring
• monitored

Answer explanation

"Nurses" es plural, por lo que el verbo va en su forma base: "monitor".

7. The pathologist _______ (analyze) tissue samples daily.

• is analyzing
• analyzes
• analyze
• analyzed

Answer explanation

"The pathologist" es tercera persona singular, por lo que el verbo debe llevar "-s": "analyzes".

8. Why _______ (the centrifuge stop) so often?

• centrifuge stops
• does the centrifuge stop
• do the centrifuge stop
• is the centrifuge stopping

Answer explanation

En preguntas en Present Simple con tercera persona singular, usamos "does" y la base del verbo: "does the centrifuge stop".

9. The researchers _______ (publish) their findings in international journals.

• publish
• published
• are publishing
• publishes

Answer explanation

"The researchers" es plural, por lo que el verbo debe ir en su forma base: "publish".

10. The microscope _______ (not work) without calibration.

• not works
• doesn’t work
• don’t work
• is not working

Answer explanation

En tercera persona singular negativa, usamos "doesn’t" seguido de la base del verbo: "doesn’t work".