This document discusses the development of complement clauses used with copular perception verbs (CPVs) like look, sound, smell, taste and feel in American English over the past 200 years. It finds that the ratio between verbs of seeming (like seem) and CPVs was reversed in the early 20th century for as if clauses. For like clauses, CPVs increased drastically in the 20th century, especially after the 1980s. Expletive it constructions increased for seem but were low for look. Seem as if remained the most frequent construction. Seem like increased in the late 19th century. The development has been bidirectional between seem and CPVs, not just from seem to CPVs.