The 1st principal form without ‘to’ e.g. Nurses look after patients in hospitals.
In questions and negatives we add ‘do’. Do nurses look after patients in hospitals?
Yes, they do./No, they don’t.
Nurses don’t look after patients.
In the 3rd pers. in Sg. we add ‘-s’,’-es’. A nurse looks after patients in a hospital.
In questions and negatives we add ‘does’ Does a nurse look after patients?
Yes, she does./No, she doesn’t.
A nurse doesn’t look after patients.
But: She is thirteen
Is she thirteen?
Yes, she is./No, she isn’t.
She isn’t thirteen.…
