This paper grounds a novel typology yielding three major types of English (L(eft)-extraction, defined by their relation to resumptive pronouns (RPs): (1) B-extractions, which require RPs in their extraction sites, (2) A1-extractions, which allow RPs in their extraction sites, and (3) A2-extractions, which forbid RPs in their extraction sites. Type B is represented by topicalization; type A1 by most instances of question extraction. The A/B distinction is supported by correlations with restrictions on definite pronouns. A2-extractions, e.g. free relative extraction, are insensitive to such and unlike A1/B-extractions are incompatible with what I call selective islands, which is explained.