 To this proposal, some respond that knowledge-how ascriptions do not pass the standard tests for detecting free relative complements (Schaffer 2009: 486–91; Habgood-Coote 2018a). Take the coordinated use of knowledge-how and other knowledge-wh ascriptions in “S has always known how to swim and never has wondered how”. This coordination suggests that both kinds of ascriptions have an interrogative as a complement (Bresnan &amp; Grimshaw 1978: 332; M. Baker 1996: 204–7). Further, knowledge-how ascriptions can be extended to embed a multiple interrogative, as in “Mark knows how to do what?” , whereas free relative complements do not tolerate multiple wh-phrases (C. Baker 1968; Bresnan &amp; Grimshaw 1978: 335). Moreover, infinitival wh phrases, such as “what to do”, “how to do”, “who to ask” never allow for free relative reading (Huddleston &amp; Pullum 2002: 1070–3). Finally, a standard test for telling apart free relatives and interrogatives is to see if they embed under “believe”, for “believe” does not take interrogatives as complements but it does tolerate free relatives. (For example, “Mark believed who was charged guilty” cannot mean “Mark believed the answer to the question “Who was charged guilty?””. Rather, it means that Mark believed the person who was charged guilty.) However, interestingly, “believe” can never embed infinitival constructions such as “what to do”, “how to do”, or “who to ask”. 