Practical Grammar and Composition

by Thomas Wood

(Substitute seen for been in the past perfect indicative of to be.)

Progressive

(Substitute been seeing for been in the past perfect indicative of to be.)

Past Perfect Tense—Passive Voice

(Substitute been seen for been in the past perfect indicative of to be.)

Future Tense—Active Voice

Simple

(Substitute see for be in the future indicative of to be.)

Progressive

(Substitute be seeing for be in the future indicative of to be.)