Questions & Answers about Open je mond voor de tandarts.
Open is the imperative form, the form used for commands and instructions.
- openen = to open
- open = open!
So Open je mond is the natural way to tell someone to open their mouth.
opent is not the normal informal command form. It is a present-tense form used with u or with hij/zij/het in regular statements.
In Dutch, just like in English, commands often leave out the subject.
- English: Open your mouth.
- Dutch: Open je mond.
The understood subject is you, but it does not need to be said.