Why is learning grammar hard?

Related questions

1. Which is grammatically correct?
2. What is vocabulary and types?
3. Who love or who loves?
4. Does reading improve IQ?
5. Is Fall American or British?
6. How many years did it take to edit Oxford dictionary?
7. How much should you read a day?
8. Who made the Oxford English Dictionary?
9. Does reading the dictionary improve vocabulary?
10. What is easier to spread jelly or jam?

Tags

1. #contradict
2. #definitely
3. #rules
4. #things
5. #confusing
6. #learn
7. #english
8. #difficult
9. #master
10. #learning
11. #meanings
12. #challenging
13. #structure
14. #languages
15. #grammar
16. #spelling
17. #existing
18. #several