In order to change the meaning of the word teach from "to give instruction" to "to give instruction with" you would add the prefix .

That depends upon the object of the preposition "with"

In order to change the meaning of the word "teach" from "to give instruction" to "to give instruction with," you would add the prefix "co-".

To arrive at this answer, one needs to understand the concept of prefixes and their purpose in modifying the meaning of a word. In English, prefixes are added to the beginning of a word to change or enhance its meaning. One such prefix is "co-", which generally means "with" or "together."

By adding the prefix "co-" to the base word "teach," the word becomes "co-teach," which now means "to give instruction with." The prefix "co-" suggests a collaborative or joint effort in teaching, emphasizing that multiple individuals are involved in the instructional process.