Read the following sentences and identify which ones are written correctly and which ones are not.
- Reviso la estructura del Present Perfect: sujeto + have/has + participio pasado.
- Verifico la concordancia del auxiliar: I/you/we/they → have; he/she/it → has.
- Verifico el participio: gone, measured, gotten, checked, made, taken, verified, mixed.
"I hasn't gone to the doctor since 2022."
- Sujeto I exige have, no has.
- Forma correcta: I haven't gone...
Incorrect.
"My brother has measured his temperature with a digital thermometer."
- Sujeto My brother (3.ª persona singular) → has.
- Participio measured correcto.
Correct.
"I have not gotten my vaccine. I need to go to the hospital."
- I have not gotten es válido en inglés americano.
- I need to go concuerda con el presente.
Correct.
"The cardiologist has checked my heartbeat and I'm in a great condition."
- has checked correcto.
- Error: se dice in great condition (sin a).
Incorrect.
"Martha and Luis has made a donation to the blood bank."
- Sujeto plural Martha and Luis → have.
- Forma correcta: Martha and Luis have made...
Incorrect.
"Ligia and Lourdes has taken new medication with good health results."
- Sujeto plural → have.
- Forma correcta: Ligia and Lourdes have taken...
Incorrect.
"Has he taken his blood pressure?"
- Pregunta con inversión: Has + sujeto he + participio taken.
- Estructura correcta.
Correct.
"She have made the experiment."
- Sujeto She → has.
- Forma correcta: She has made the experiment.
Incorrect.
"I have verified the patient's oxygen levels."
- I have + participio verified.
- Estructura correcta.
Correct.
"How has you mixed the injection?"
- Sujeto you → have, no has.
- Forma correcta: How have you mixed the injection?
Incorrect.




