Question

which sentence contains an infinitive?○ will you take the package to sheila?○ we walked to town with grandma.○ please forward that photo to me.○ it is normal to make mistakes.

Explanation:

An infinitive is the base form of a verb preceded by "to". In the first three sentences, "to" acts as a preposition linking to a noun/pronoun. Only the last sentence has "to make", where "to" pairs with the base verb "make" forming an infinitive.

Answer:

It is normal to make mistakes.