"Where is Donald? I need a joiner."
Translation:Càit a bheil Dòmhnall? Feumaidh mi saor.
càit a bheil is just a newer spelling of càite a bheil (the first omits a silent vowel whereas the second doesn’t), both mean the exact same thing and are actually two ways to write down the same exact words.
This course started using the older spelling, càite a bheil, but afaik now transitions to the new recommended one, càit a bheil. Both should be accepted in all sentences where it appears.