ABRAHAM:
The police officer grabbed the thief
The fire fighter turn off fire
The docter treat the people

CORRECT:
The police officer grabbed the thief.
(Don't forget the period to close your statement.)

The firefighter turn off fire.
(Be careful on spelling some words.)

The doctor treat the people.
(Don't forget the period and next time be careful on spelling some words.)

COMMENT:
 Hi, Abraham!
Thank youf or sending me your homework. Good job! I can see that your sentences are improving and it seems like you are really applying the things that you've learned in our discussions. Keep it up!
-Teacher Joanna ^_^