seeing
Present Tense—Passive Voice
being seen
Perfect Tense—Active Voice
having seen
Perfect Tense—Passive Voice
having been seen
CHAPTER VI
CONNECTIVES: RELATIVE PRONOUNS, RELATIVE ADVERBS, CONJUNCTIONS, AND PREPOSITIONS
78. Independent and Dependent Clauses. A sentence may consist of two or more independent clauses, or it may consist of one principal clause and one or more dependent clauses.