Какое слово simon's is small but nice

english is an international language. a lot of people speak english all over the world. it is the most popular language after chinese. i want to learn english in order to communicate with different people all over the world. also i like travelling and if i know english i will be able to travell without any difficulties.

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.