... year of 2012/2013? 2) What are the causes of the errors in the uses of the modal verbs “can”, “could”, “may”, might made by the students of English in grade 11 at Que Vo School in the school ... presupposition Some questions are raised: 1) What kinds of errors in using the modal verbs “can”, “could”, “may”, might are made by the students of English in grade 11 at Que Vo High School in the school ... of English Que Vo High School in the school year of 2012/2013 in using the modal verbs “can”, “could”, “may”, might 2) To find out the causes of the errors in the uses of the modal verbs “can”,...