How do I know if I have to use the one with accent and not the one without accent? Could you provide examples?
It's just a matter of stress. If the stressed syllable is the first one, you don't write the accent. If it's the last one, you do.
You know, the rule states that "if the stress is in the last syllable and it ends in vowel, n or s, you must write the accent".
esté are forms of the verb
este are demonstratives or pronouns.
- Esta mesa está aquí.
- Es mejor que este jarrón esté aquí.