De-and Con - have nearly opposite meanings. Think about the meaning of destroying, and then write a word that means the opposite and uses the prefix con-

Destroying is the present continuous tense for destroy.

construct and destruct are antonyms

Constricting is the present continuous tense for construct

Explanation:

A prefix is a forefix, a foresyllable essentially consisting of one or more letters or syllables placed at the beginning of a word to modify its meaning.

The prefix "con-" is often placed in front of certain words to obtain something new, few times informal, other times subcultural words and meanings.

Example of the meaning it can give to words includes something constructed or artificial, something hypothetical or rather fictional, other times it related to the concept of conlangs, conworlds the list goes on.

Answer

The word is "constructing".

Explanation:

A prefix can be defined as a letter or group of letters added to the beginning of a word with the intention of forming a different word. The prefix de - is added to a word to convey removal, separation, negation, reversal, etc. On the other hand, the prefix con - conveys association and togetherness. As was stated in the question, they are nearly opposite meanings. Therefore, if we think of the word "destroying" and its meaning - demolishing, knocking down, putting an end to the existence of something -, the word that uses the prefix con - and that means the opposite is "constructing". To construct means to put up, to build, to set up, or to establish something.