To talk about jobs in English we say "I am a teacher" or "She is a doctor". Use a/an before the job: "He is an engineer" (vowel sound → an).
Common jobs
teacher
/ˈtiː.tʃər/
She is a teacher.
doctor
/ˈdɒk.tər/
My dad is a doctor.
nurse
/nɜːs/
She is a nurse at the hospital.
engineer
/ˌen.dʒɪˈnɪər/
He is an engineer.
chef / cook
/ʃef/ /kʊk/
She is a chef in a restaurant.
driver
/ˈdraɪ.vər/
He is a taxi driver.
police officer
/pəˈliːs ˈɒf.ɪ.sər/
She is a police officer.
firefighter
/ˈfaɪər.faɪ.tər/
He is a firefighter.
farmer
/ˈfɑː.mər/
My uncle is a farmer.
artist
/ˈɑː.tɪst/
She is an artist.
singer
/ˈsɪŋ.ər/
He is a famous singer.
actor / actress
/ˈæk.tər/ /ˈæk.trəs/
She is an actress.
waiter / waitress
/ˈweɪ.tər/ /ˈweɪ.trəs/
He is a waiter in a café.
student
/ˈstjuː.dənt/
I am a student.
footballer
/ˈfʊt.bɔː.lər/
He is a professional footballer.
a or an before jobs?
Use a before consonant sounds: a teacher, a doctor, a nurse. Use an before vowel sounds (a, e, i, o, u): an engineer, an actor, an artist.