to count on something
The phrase 'etwas haben' is a common way to express possession or ownership in German. It is formed by combining the pronoun 'etwas' (something) with the verb 'haben' (to have). This phrase is used in the same way as its English counterpart, 'to have something'. For example, 'Ich habe ein Buch' (I have a book) or 'Sie hat einen Hund' (She has a dog).
You must have some patience.
In the German language, 'Du musst etwas Geduld haben' means that you need to have some patience. It uses the word 'etwas haben' in the context of possessing patience.
I must have some time to do that.
'Ich muss etwas Zeit haben, um das zu machen' means that one needs some time to accomplish something, illustrating the usage of 'etwas haben' to denote the need for a certain amount of time.
He might have some fever.
The phrase 'Er könnte etwas Fieber haben' suggests that someone could possibly have fever. Here 'etwas haben' is used to express the potential possession of a symptom or condition.