If the clause is essential (i.e., if the clause is essential to the meaning of the sentence) and the relative pronoun is the object of the clause, the relative pronoun can be omitted. The relative ...

For example, in the sentence 'I really ... Que comes before a noun or pronoun and relates to the object of the verb. When used as a relative pronoun, où can mean ‘where’.

Relative clauses are bound clauses that modify NPs and occasionally CPs. The former are adjoined to NPs. A relative clause contains a WH-phrase which moves and is adjoined to CP: The student who likes ...