3.200 'to'-infinitive showing purpose

Note that verbs which indicate a deliberate action are sometimes followed by a 'to'-infinitive clause which expresses purpose.

• Several women moved to help her.
• The captain stopped to reload the machine-gun.

This is not a phase structure because the first verb has a complete meaning of its own; the second verb is giving a reason for the first action, not completing the information about it.

Note that in this structure, 'to' can be extended to the phrase 'in order to'. See paragraphs 8.43 to 8.46 for more details.