The homework was very hard last night. I _______ do it.
couldn`t
When he was younger, Tim _________ play football very well.
could
My great-grandfather was very intelligent. He ________ speak four languages.
could
My dog ________ read but he was very smart.
couldn`t
I`m good at music. I _______ play the guitar.
can
My sister loves chess but I _______ play it.
can`t
