Learn Hardcore Greek: Θέλω να σου συστήσω τη φίλη μου· είναι ήρεμη και τη συμπαθώ πολύ. - I want to introduce you to my friend; she is calm and I like her a lot.

The word να is extremely common in Greek and is used where English often uses the infinitive (to do, to go, to say). Modern Greek does not have an infinitive in the same way English does.

Why is it συστήσω here? What form is that?

συστήσω is the aorist subjunctive form of συστήνω.

After να, Greek often uses a subjunctive form, and the choice between present and aorist usually depends on whether the action is seen as:

ongoing / repeated → present
single / complete event → aorist

Here, introducing someone is viewed as a single complete action, so Greek uses:

να συστήσω = to introduce

A learner may also meet:

συστήνω = I introduce / I recommend
να συστήνω = to be introducing / to introduce regularly
να συστήσω = to introduce once / as a complete action

In this sentence, να συστήσω is the natural choice.

Does συστήνω only mean ?