Какое число в записи 14 минус 9 равно 5 является уменьшаемым

1. two new engineers just were introduced to the head of the department.2. i am sure i will be asked at the lesson tomorrow.3. they told me that the new student was spoken much about.4. he said that the grandmother's letter was received the day before.5. this new dictionary was sold everywhere now.6. all the texts were looked through yesterday and a single mistake was found.

1. i exercise regularly in summer but more to do in winter. 2. she usually walks slowly but now she is walking even   faster . 3. nina speaks loudly but mary speaks even   louder . 4. he runs fast, than other boys. 5. i don’t sleep enough, less   than 8 hours. 6. he behaves badly, than other boys. 7. i smile often, more than my sister. 8. peter lives far from school, but ann lives closer .

я думаю, что  4 и в 6 предложениях ничего изменять не надо. может я ошибаюсь.