20. I had such a lot of trouble with my schoolwork that I had to ask for help.
21. There were such a lot of questions on the test that I couldn't finish it in half an hour.
22. The children took such a large bite of sandwich that he couldn't chew it.
23. It was such a delicious desert that I decided to order portion.
24. It was such a strong wind that it blew down several banyan trees in this village. (tất cả câu trên ko thể dùng 'so a')
25. There were so many people in the hall that we couldn't see Professor Taylor. (ko thể dùng 'such many')