The Quick and Easy Guide to Learning Noun Clauses | Adjective Clauses | Adverbial Clauses | If Clauses Noun Clauses. Overview of Noun Clauses. Object Position. Subject Position. To be. Preposition. Tense Agreement In Noun Clause. Subjunctive Mood. Wh- / how. Relative Clauses. Overview of Relative Clauses. Subject Position.