Потому что это герундий. Иногда перед герундием может стоять предлог, в данном случае "by playing" означает "проигрывая" (деепричастие) или "путем проигрывания".
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It is said that charity begins at home, and people in the UK seem to have put these words into practice. Their enthusiasm for helping others shows in the 187,000 charity organisations that exist in the country. Some of the most famous ones are Oxfam, Age Concern, the RSPCA, the British Heart Foundation and Marie Curie Cancer Care.
People donate money to charity organisations or volunteer to help them raise money. Many of these organisations run charity shops. The first chanty shop in the United Kingdom was established by Oxfam in Broad Street, Oxford. Oxfam has the largest number of charity shops in the UK with over 800 stores.
Charity shops sell goods at very low prices. The items for sale are usually second-hand and donated by members of the public. These include books, records, CDs, clothes, accessories, household items, furniture and costumes for special occasions such as Halloween. There are bargains for everyone! Some charity shops also sell new goods that are somehow related to the cause they support.In Oxfam stores, for example, you can find fair trade food and crafts.