This dataset contains the data (SPSS .sav file) used in the MSc by Research (Linguistics) dissertation 'An Investigation into the Locality Effects Found in Dutch and Frisian Specificational Copular Sentences'. This data was collected from Dutch and Frisian participants and shows how they respond to specificational copular sentences when they are embedded under modal and raising verbs. Two tests were conducted: the first was a cloze test where participants had to fill in the missing finite verb in the sentence. This tested whether participants used a finite verb which agrees with the first noun phrase or the second noun phrase. The second test was a judgement test where participants had to rate different versions of the same sentence where the finite verb either agreed with the first noun phrase or the second noun phrase.