You wrote
He (mistake, should be: is an engineer) is engineer
Correct
He is (fixed) an engineer
a / an before one thing or a job
3 mistakes
Em português dizemos 'comprei luminária nova' e 'ele é engenheiro'. Em inglês é preciso 'a' ou 'an': 'a new lamp', 'an engineer'. Palavra com som de vogal no início pede 'an'.
A single countable thing needs a/an: a new lamp. Jobs need it too: he's an engineer. Words that start with a vowel sound get 'an': an exhibition, an hour.
Uma coisa só ou uma profissão? Coloque a/an na frente.
Wrong: I bought new lamp for my desk
Right: I bought a new lamp for my desk
Wrong: Maybe, there's a exhibition at the gallery
Right: Maybe, there's an exhibition at the gallery
Wrong: He is engineer
Right: He is an engineer
He (mistake, should be: is an engineer) is engineer
He is (fixed) an engineer
Maybe, there's (mistake, should be: an exhibition) a exhibition at the gallery
Maybe, there's (fixed) an exhibition at the gallery
I (mistake, should be: bought a new lamp) bought new lamp for my desk
I bought (fixed) a new lamp for my desk