Questions & Answers about Tato změna je důležitá.
Both are possible, but they are used a little differently.
Tato změna is more explicit and often feels a bit more formal, careful, or written. It clearly means this change.
Ta změna can also mean that change, and in everyday Czech it is often used where English would still say the change or sometimes this change, depending on context. So tato is the clearest textbook form for this.
You may also hear tahle změna in spoken Czech. That is a common colloquial equivalent of this change.
Tato is a demonstrative pronoun/determiner, meaning this.
In Czech, words like this change form depending on:
- gender
- number
- case
Here, změna is:
- feminine
- singular
- nominative
So the correct form is tato.
Some nominative singular forms of this are:
But tato is the fuller, more explicit form often taught to learners. So:
- tato změna = this change
- to město = this town/city
- ten problém = this problem