Questions & Answers about כשהוא עייף, הוא לא רוצה לנגן בפסנתר; הוא רק שומע מוזיקה בשקט.
It is כש־ + הוא.
- כש־ means when
- הוא means he
So כשהוא literally means when he.
In everyday Hebrew, כש־ is very common. A more formal alternative is כאשר.
In Hebrew, the verb to be is usually not expressed in the present tense.
So:
- הוא עייף = he is tired
- literally, it is closer to he tired
That is completely normal Hebrew.
But in the past or future, Hebrew does use forms of to be:
- כשהוא היה עייף = when he was tired
- כשהוא יהיה עייף = when he is/will be tired