1 . 20 years ago, this city had fewer cars than today ( today: 1 milion cars; 20 years ago: 10,000 cars)
2. Dharavi slum in Mumbai has more people than Kibera slum in Nairobi (Dharavi há 1,000,000 people; Kibera has 700,000 people)
3. April has fewer days than March ( dùng fewer vì sau"day"-có "s")
4. My car uses fewer litres of fuel than his car( dùng fewer vì sau"litre"-có "s")