Questions & Answers about כשהמורה מדברת, צריך לשתוק.
It is made of two parts:
- כש־ = when / while
- המורה = the teacher
So כשהמורה means when the teacher...
In Hebrew, short words like כש־ are often attached directly to the next word instead of being written separately.
Because מורה can mean either male teacher or female teacher in unpointed Hebrew spelling.
The spelling המורה is the same for both:
- the male teacher
- the female teacher
What tells you the gender here is the verb מדברת, which is feminine singular. So in this sentence, the teacher is female.