6.110 referring to manner
Prepositional phrases are also used to say something more about the manner in which an action was performed, or the way in which it should be done.
Prepositional phrases such as 'on foot' or 'by bus' can be used to indicate a method of travelling.
The use of prepositions to talk about manner is explained in paragraph 6.109.
6.111
You can also use prepositional phrases to give more information about the feelings of the person performing the action.