Are these pronouns or adjectives?

Hi,

this that these those - are these demonstrative pronouns or demonstrative adjectives?

They are both. eg Pronoun - This is a banana. I like this.                eg Adjective - I'm going to eat this banana.

what where which who and whose - are these interrogative pronouns or interrogative adjectives?

Are these pronouns or adjectives? In two textbooks, they are categorized differently which is really confusing.

They should be adjectives I think

Let's look at 'what', for instance. Again, it can be both.

eg Pronoun - What do you mean?              Adjective  - What books do you like?

I think that you need to make and consider some actual sentences like these with the others, instead of just thinking 'theoretically'.

I'm surprised that your textbook does not make this clear. Try looking in a good dictionary and see what it says.

Best wishes, Clive