Please tell me where the subject of "were" in the sentence is.Please parse it.
"He compiled a list of what he thought were the seven wonders of the world."
"He compiled a list of what he thought were the seven wonders of the world."
subject search
"He compiled a list of what he thought were the seven wonders of the world."
He - Subject - pronoun - John
compiled - Verb - did something - action
a - determiner
list - Noun - book / program / etc
of - preposition -
what - pronoun - places / objects / etc
he - Subject - pronoun
thought - Verb - did something
were - Verb - did something
the - determiner - before a noun
seven - adjective - describing the noun
wonders - noun - places / visits
of - preposition
the - determiner
world - noun - places / object
He - Subject - pronoun - John
compiled - Verb - did something - action
a - determiner
list - Noun - book / program / etc
of - preposition -
what - pronoun - places / objects / etc
he - Subject - pronoun
thought - Verb - did something
were - Verb - did something
the - determiner - before a noun
seven - adjective - describing the noun
wonders - noun - places / visits
of - preposition
the - determiner
world - noun - places / object
"He compiled a list of what he thought were the seven wonders of the world."
"He compiled a list" "of what he thought were the seven wonders of the world."
The list was of the seven wonders of the world.
The list of the seven wonders of the world
"The list of what he thought" were "the seven wonders of the world"
"His list" of "the seven wonders"
"He compiled a list" "of what he thought were the seven wonders of the world."
The list was of the seven wonders of the world.
The list of the seven wonders of the world
"The list of what he thought" were "the seven wonders of the world"
"His list" of "the seven wonders"
"[W]ere" refers to "what". But it's not a subject. The only subject in that sentence is "[h]e".