PLS tell me whether the sentence below is correct or not.
1 Let the person speaking know that you are listening to him.
2 Let the person speaking that know you are listeing to him.
The first one is correct:
EX: Let the person (who is) speaking know that you are listening to him.
The underlined portion modifies "the person". The shortened form looks like this,
EX: Let the person know that. . . .
"that . . . " functions as the object of the verb "know".
All the best,