Questions & Answers about Pridružite se razgovoru.
The base form is pridružiti se.
Here, pridružite is the imperative form, used to tell or invite someone to do something: join.
More specifically, pridružite is the 2nd person plural imperative, which Croatian also uses for:
- you all
- formal/polite you to one person
So Pridružite se razgovoru. means something like Join the conversation.
Because the verb is pridružiti se, not just pridružiti in this meaning.
In Croatian, some verbs regularly come with se, and you need it as part of the verb pattern. Here, se is part of the construction meaning to join.
So:
- pridružiti se nekome/nečemu = to join someone/something
If you leave out se, the sentence sounds wrong in this meaning.