Questions & Answers about Ten sweter jest cieplejszy niż tamten.
They are demonstratives:
- ten = this
- tamten = that
In this sentence, both refer to a masculine singular noun, sweter, so they appear in the masculine singular form.
A useful thing to notice is that tamten at the end stands by itself, but it really means tamten sweter. Polish often leaves out a repeated noun when it is obvious from context.
Because sweter is a masculine singular noun.
In Polish, words like this and that, and also adjectives, must agree with the noun in:
- gender
- number
- sometimes case
So with sweter, you get masculine singular forms:
- ten sweter
- tamten sweter
- cieplejszy sweter
If the noun were feminine, you would use ta and tamta instead.