Please mark the stress in the following words: Conduct(verb) Conduct(noun) Produce(verb) Produce(noun)

In the four words you're asking about, the verb forms put
the stress on the second syllable, and the noun forms stress the first syllable. Let me
use boldface/rom type and caps/lc to show you what I mean. The stressed syllables are
capitalized and printed in boldface type:

verbs:
conDUCT and
proDUCE

nouns:
CONduct and
PROduce

Webster's dictionary
labels stressed syllables with a  '. So the phonetic spelling of the noun form is
ˈkän-(ˌ)dəkt. The phonetic spelling of the verb is kən-ˈdəkt. You can listen to the
pronunciation of each word at the web site link in the sources
section.