that clause as Direct Object

The coach thinks that Sammy is an excellent athlete.

-psych verbs: know believe, hope , wish, assume, guess,
-sensory verbs: hear, see, feel
-communicate: say, argue, note, insist, demand, agree, suggest, indicate, write

Note that there are a few words that can take clausal DO but cannot take simple NPs or pronouns. *I insisted it is ungrammatical.