Grammar reference and practice » Стр.164 (2)

Read the sentences and complete with by if you think you need to. If not, don’t write anything. 1. I waited for 40 minutes by myself. 2. Please help yourself! 3. Alexa didn’t have any brothers or sisters, so she was used to being by herself. 4. The children are too young to go out by themselves. 5. Ben always covers himself in sun cream when he goes out in the sun. 6. I really hope we enjoy ourselves.