form a sentence with the 2 conjunction words she's and cann't

You mean contractions??

she's = "she is" or "she has"

can't = cannot
(watch the spelling)

Once you have come up with sentences, please post them and we'll check your work.

Umm... Maybe:

She's going to buy him a present, but can't decide what to get him.

Maybe something along those lines?
I don't know if that works or not.

To form a sentence using the words "she's" and "can't," you can say: She's unable to attend the party tonight because she can't find a babysitter.