Потому что это герундий. Иногда перед герундием может стоять предлог, в данном случае "by playing" означает "проигрывая" (деепричастие) или "путем проигрывания".
Hello, my
friend!
I was very
glad to get a letter from you!
I have a
pet too. I have a cat. It is boy. His name is Tom. He is cute and very funny. I
feed him twice a day. I wash him. He didn’t like it. I play with him. I would
like to have a dog.
How did you
celebrate your birthday? Did you have many guests? What other presents did you
get?
Sorry. I
have to go. I need to feed Tom.
<span>Bye! </span>
1)My friends and I always see each other eye to eye.
Во втором ты итак сделала из этой же идиомы предложение.
3)Ben always get on his parents nerves.
4)I've always been pain in the neck for my teachers.
1. She gave me an appealing look
2. This kind of dog exists only in Japan
3. I travel to all parts of the globe
4. Mother left me a message
5. She dominates her husband
6. Global warming is not going to happen soon
7. English is a kind of universal language
8. He appealed to us for help
9. I sell clothing online
Since означает "с какого-то времени" - since 5 o'clock=с 5 часов, since Monday=с понедельника.