This is so because they used to belong to the first class.

The study found that at least 70 percent of the population belonged to the working class.

Try, if you can, to belong to the first class.

Most people living in this district belong to the lower middle class.

All the samples in the list belong to the same class.

One of the animals on your screen belongs to a different class from the others.

At the extreme, each individual belongs to a different class.

Most of his clients belong to the middle class and low income families.

Whether one belongs to the emerging middle class has much to do with age.

There are also others who belong to the educated middle class.