Learn Hardcore Hebrew: אמא אומרת שהיא עוד במשרד. - Mom says that she is still at the office.

אמא = Ima (Mom)
אומרת = omeret
שהיא = she-hi (that she / she is)
עוד = od
במשרד = ba-misrad or be-misrad, depending on whether you mean in the office or in an office. In this sentence, the natural translation is usually at the office / in the office.

The main stress is typically:

Why is it אומרת and not אומר?

Because אמא (Mom) is grammatically feminine singular.

In Hebrew present tense, the verb agrees with the subject in gender and number:

So:

Does אומרת mean or ?