Parts of Speech

Please could you tell me if these are correct parts of speech and help me with one Im not sure of

1. When does the train leave - 'does' =

2. I want to go but I can't - to do = an adverb

3. Why do you speak so slowly 'why' - adverb

Many thanks

[Buddhaheart]

1. When does the train leave - 'does' = Auxiliary (helping) verb. It helps to form a question.

2. I want to go but I can't - to go = an adverb No. It’s a verb infinitive or simply the infinitive.

3. Why do you speak so slowly 'why' - adverb U