To is a versatile preposition and infinitive marker, but there are plenty of synonyms that can replace it in various contexts. For instance, instead of "to," you can use "toward," "unto," "for," "in order to," or "as a means to." These alternatives indicate the direction or purpose of an action. When "to" functions as a preposition of connection or transfer, other substitutes can be "into," "onto," "till," "towards," "next to," "by," or "near." Each of these words has slightly different nuances, so it's important to consider the meaning of the sentence before choosing a substitute for "to".