With the infinitive form of a verb in English, (e.g. to speak), the word 'to' seems to convey a specific meaning where, in Spanish, an additional preposition is used in some cases.
I can use running shoes to run faster
The direct English translation is:
Puedo usar zapatillas correr más rápido
Seemingly, the more correct Spanish expression is:
Puedo usar zapatillas para correr más rápido
If we take the correct expression to include the preposition 'para' , which signals a reason or means 'in order to', in the English, the word 'to' here covers that meaning as well as forms the infinitive.
I was wondering if there are some common rules for when to place prepositions before infinitive verbs, and which to use. (Such as ir+a+infinitive).