Final answer:
The word 'to' can indeed act as both an infinitive verb and a preposition in one sentence, such as 'I plan to go to the store,' where the first 'to' is part of the infinitive 'to go,' and the second indicates direction as a preposition.
Step-by-step explanation:
Yes, the word 'to' can function as both an infinitive verb and a preposition in the same sentence. An example of this would be: 'I plan to go to the store.' In this sentence, the first 'to' is part of the infinitive verb 'to go,' indicating an action to be performed, while the second 'to' is a preposition indicating direction, showing where the action of going is directed towards.
An infinitive often serves as a noun, an adjective, or an adverb in a sentence. For example, in the sentence 'To read before bed helps you relax,' the infinitive phrase 'to read' is acting as the subject. Similarly, 'She had a plan to write a novel,' here 'to write a novel' functions adjectivally to describe 'plan.'