"They are not doing this."

[jgvdangelo]

Why is the subject coming after the object here, i.e, why isn't it: "Onlar bunu yapmiyor"

[Ehecatotontli]

Why not "bunu onlar yapmiyorLAR"?

[AlexinNotTurkey]

It was a forgotten alternative. If you have a plural subject, the suffix -lAr is optional on the verb. It is only required when you do not state your subject.

"Onlar geliyorlar"="Onlar geliyor"="Geliyorlar"

In my experience, it is more common to drop "-lar" if you state your plural subject :)

[Ehecatotontli]

Thanks! Even when I think I know the rule, if it marks it wrong I get confused.

[LiliaSfaxi]

Why not "onlar bu yapmiyorlar" ?

[Selcen_Ozturk]

"this" is a direct definite object and has to be in accusative case

[1GRB]

Why is "Bunu yapmiyor" wrong?

[AlexinNotTurkey]

if you do not state "onlar" you must use the -lar suffix. Something has to mark a plural subject.

[israa939411]

buna onlar yapmiyorlar