"They usually work with my parents."

Translation: Oni zwykle pracują z moimi rodzicami.

[Filavero]

Would "naj częściej" be a suitable translation for "usually"?

[tadjanow]

No. "Najczęściej" (which is a single word) means "most frequently" or "most often".

E.g. "Oni pracują z różnymi ludźmi, ale najczęściej z moimi rodzicami" - "They work with different people, but most often with my parents."

[Filavero]

To me, that seems the same, but looking it up, I can see there are fine differences.

[deactivated user]

And what about "zazwyczaj"?

[Jellei]

It should work. Was it not accepted?

[deactivated user]

I saw it among the three proposed variants and I just wondered if it would work.

[Jellei]

"Zazwyczaj" itself would, but watch out, the sentence may have some other mistake - if the word itself was not taught, it's probably not used in a correct option even if it's a synonym. At least that's what comes from my observations of Russian course.

[NJPrzychodna]

No, it wasn't.

[toplexil]

It was not accepted for me either (and the rest was good, spelling, word order..)

[Djx234]

there has been no indication that zazwyczaj is not an acceptable alternative.

[Jellei]

But it is, and it is already on the list of accepted answers.

[Jan.K.M]

Normalnie pracują z moimi rodzicami

[Jellei]

Hmmm. Hmmm hmmm hmmm... okay, I guess it can work, added.

[tczek]

Normally is normally and usually is usually.