Particles do not change.
Example
The infinitive 'to' in 'to fly' is an example of a particle, although it can also act as a preposition, e.g. 'I'm going to Spain next week'.
In the classroom
Many words can be described as particles, e.g. conjunctions such as 'and' and 'but' and interjections such as 'oh' and 'wow'. Particles appear frequently in the teaching of phrasal verbs, which can be grouped for teaching purposes by particle, e.g. 'off', 'on', 'out' etc.
Further links:
https://www.teachingenglish.org.uk/article/multi-word-verbs-learner-problems
https://www.teachingenglish.org.uk/article/multi-word-verbs-methods-approaches
https://www.teachingenglish.org.uk/article/making-it-phrasal-verb-stories