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1. Retail shops were transformed into shopping malls over the centuries.

2. Sometimes retail shops are transformed into shopping malls over the centuries.

3. Soon retail shops will be transformed into shopping malls.

4. Many retail shops are being transformed into shopping malls now.

5. Many retail shops were being transformed into shopping malls in the last 5 years.

6. Many retail shops had been transformed into shopping malls before 2015.

7. Retail shops have been transformed into shopping malls since 2010.

8. Retail shops will have been transformed into shopping malls by 2025.