Which parts of speech do the following words in capitals represent:

She's going TO London

I WONDER what will happen

When DOES your flight get in?

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Many Thanks!!
Nicely done Maj! Emotion: smile
TO - preposition
WONDER - verb
DOES - auxiliary verb (do)
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- She is not going anywhere yet.
- She does not know what will happen.
- She has not booked any flights.

You write not after the verb to be and other modals. You use the verb "do" with the rest of the verbs.
 Mike in Japan's reply was promoted to an answer.