Musíme vyřešit hádanku.

must/to have to

Breakdown of Musíme vyřešit hádanku.

• hádanka: the riddle
• vyřešit: to solve

Questions & Answers about Musíme vyřešit hádanku.

What does musíme mean, and what form is it?

Musíme is the 1st person plural present form of muset (to have to / must).

So:

• musím = I must
• musíš = you must
• musí = he/she/it must
• musíme = we must
• musíte = you must (plural/formal)
• musí = they must

In this sentence, musíme already tells you the subject is we, so Czech does not need a separate my.

Why is there no word for we in the sentence?

Because Czech usually drops subject pronouns when they are clear from the verb ending.

• Musíme vyřešit hádanku. = We must solve the riddle.

The ending -íme already shows we.

You can add my if you want emphasis or contrast:

• My musíme vyřešit hádanku. = We have to solve the riddle.
  (for example, not someone else)

So the version without my is the normal, neutral one.

Why is it vyřešit and not řešit?