Infinitives are composed of the preposition “to + verb”.
Infinitives represent future or abstract activities that have not yet happened. The following examples may help to clarify this:
- To fly over the Andes was his dream.
- To enter the Basílica de la Sagrada Familia in Barcelona would require a long wait in line.
- To learn a second language is her main goal.
- To wait in the rain and wind seemed silly.
The first two examples are actual representations that may happen in the future. The last two examples are abstract ideas that also have not yet happened.
Simply ask the “who or what” question to determine the subject.