Which sentences include infinitives? Check all that apply.We always believed we had the ability to become doctors.To buy the expensive vase seemed foolish when they still had debt.She presented the gift to him last night.They all wanted to fly across the country.Arriving late is unacceptable to our principal.

An infinitive is the base form of a verb, usually preceded by “to.” In A, “to become” is an infinitive; in B, “to buy” is an infinitive; and in D, “to fly” is an infinitive. In C and E, “to” is a preposition, while “arriving” in E is a gerund, not an infinitive.

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