Also, can't help but or cannot but. Be unable to do otherwise. For example, I can't help thinking that the keys will turn up eventually, or He couldn't help but believe he would pass the entrance exam, or I cannot but applaud his efforts. The first of these phrases, can't help, is always followed by a present participle whereas the others take an infinitive. [c. 1700]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.