8. I couldn't go to school because of my sickness.
   - Because I was sick, I couldn't go to school.

9. Your younger brother is too weak to lift that box.
   - Your brother is not strong enough to lift that box.

10. I study English so that I can improve my knowledge.
   - I study English so as to improve my knowledge.

8. Because i was sick, i couldn't go to school.
9. Your brother is not strong enought to lift that box.
10. I study E so as to improve mt knowlege.
LIKE VÀ CHẤM ĐIỂM NHÉ:3.

1. Because he was ill, he couldn't go to school.
2.Your younger brother is not strong enough to lift that box
3. She studies English so as to improve her knowledge 
 

8. Because I feel sick, I couldn't go to school.
9. Your brother is not strong to lift that box
10. I study English so as I can improve my knowledge