demandez

In a sentence

• Demandez à votre professeur si vous avez des questions.

  Ask your teacher if you have any questions.

  The word "demandez" is used in its imperative form, giving a polite instruction to perform the action of asking.

• Pouvez-vous me dire si je devrais demander de l'aide ?

  Could you tell me if I should ask for help?

  Here, "demander" is in its infinitive form, used as the main action in the indirect question.

• Elle demande toujours des conseils lorsque elle est incertaine.

  She always asks for advice when she is uncertain.

  In this sentence, "demande" is used in third person present tense, describing an ongoing habit or action of the subject.