Помогите пожалуйста! Use the Present Perfect instead…

Помогите пожалуйста! Use the Present Perfect instead of the infinitives in brakel. a) My father not _______ (to be) in Spain. b) You________ (to book) tickets? c) They police not________ (to find) the burglar yet. d) They jast ________ (to walk) in the park. Прошу, очень надо!