Interesting question. This "feels" valid (as a native speaker) - the "that" or "if" is implicit - but not a rule I had ever identified before. Looks like this

Interesting question. This "feels" valid (as a native speaker) - the "that" or "if" is implicit - but not a rule I had ever identified before. Looks like this may be called an "empty complementizer"; some more info here: https://en.wikipedia.org/wiki/Complementizer#Empty_complementizers https://en.wikipedia.org/wiki/Complementizer#Empty_complemen...