Can someone please correct these sentences?

I am bringing the pen from home.

Ben kalem evden getiriyorum.

I am cleaning the house.

Ben evi temizliyorum.

This is a big house.

Bu bir büyük ev.

Students and teachers are at school.

Öğrenciler ve öğetmenler okuldalar.

Our friends are at the course.

Bizim arkadaşımız kurs´tayız.

Mehmet is coming from the course.

Mehmet kurs´tan geliyor.

I am finishing (the) work.

Ben işi bitiriyorum.

THANKS!!!

Thank you very much.

Birşey değil

Students and teachers are at school.

Öğrenciler ve öğretmenler okuldalar

Note : You can use "plural ending " when it refers human [the reason being is that to respect human beings by using plural ending ]       "okuldalar "

This view is defended by some grammarians [grammar experts] and I agree with them.

i think this should be okullarda

 I dont think. As you look at the original sentece the school is singular not plural.

Students and teachers are at school.----------> okulda

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if it was  "at schools " [plural] then that would be " okullarda "

thankyou tunci, i misunderstood your previous message no.5

 its ok.soyelcin..sorun değil.