1. quiet -> quieter
2. wide -> wider
3. high -> higher
quiet -> quieter
wide -> wider
high -> higher
-------------------------
Adj (ngắn) + Er
1. quiet -> quieter
2. wide -> wider
3. high -> higher
1. quiet -> quieter
2. wide -> wider
3. high -> higher
1. quiet -> quieter
2. wide -> wider
3. high -> higher