Hello again,
I have another problem. Is is better to say: "a fire figher fights fire" or "a fire fighter fight fires"?
Should I use "the" before "fire/fires"?

Thank you.
Both of them are possible. 'fight' and 'fighter' are together.
What do you mean 'fight' and 'fighter' are together?
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I am sorry, Magda. The words 'fire' and 'fighter' should go together. Firefighter.
I think two forms are correct, at least according to my dictionary Emotion: wink .
A firefighter fights fires. (about his job, general; the verb is simple present)
A firefighter is fighting the/several fires in the appartment building across the street. (specific fires; see the continuous present)
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Thanks, Marius!