a. He is such a boy as everyone likes him.
b. He is such a boy that everyone likes him.
c. He is such a boy as liked by everyone.
d. He is such a boy that is liked by everyone.
Which sentence is correct and why? What is the actual constitution of the this sentence? It is taught here that when one clause has the word 'such' the other clause will take the word 'as' to correlate with the first clause. The given answer says that the option (B) would be correct if an adjective is added before the noun that constitutes like this, He is such a friendly boy that everyone likes him. The word 'such' also functions as an adjective. So, why is it necessary to use 'such' as an adverb by adding another adjective with the noun 'boy'? Furthermore, how to find out wether 'as' is being used as a conjunction or as a relative pronoun.