Does anybody know of any online resources for teaching the structure "seems to..."?

One of my textbooks has it as a grammar point (eg. "She seems to know something"; "I seem to be forgetting things these days"; "He didn't seem to be listening to me" etc.). So I'd like to teach it but I'm not quite sure of the usage rules - like, when can you drop 'to be'? How do the rules governing its usage compare to the rules governing 'seems like' (and is it worth teaching the two together)?

And I'm struggling to think of a fun way to teach it. Maybe charades, I guess, but I wonder if there's anything better...

As far as I can tell, it's practically impossible to search for on the internet because 'seems' is such a common word, so I'd be grateful if anyone has any suggestions.