Questions & Answers about Acesta este momentul.
Because acesta is a demonstrative pronoun: it means this one / this and can stand by itself.
So:
- Acesta este momentul. = This is the moment.
- Acest moment... = This moment...
A very common learner mistake is using acest by itself. In standard Romanian, if no noun follows, you normally use acesta.
Momentul is moment + the definite article.
- moment = moment
- momentul = the moment
Romanian usually puts the at the end of the noun instead of using a separate word like English does.
So -ul here is the masculine singular definite article.