IV. There is a mistake in each sentence. Find and correct it. 26. What are you doing in Sunday? 27. Do you often walk to school on foot? 28. My little sister is looking forward to the Childrens’ Day. 29. Look! A cute squirrel picks up some nuts. 30. Do you have this shirt on bue?

`26`. in `->` on

`->` on + ngày trong tuần

`27`. on foot `->` bỏ

`->` go on foot `=` walk: đi bộ

`28`. Childrens' `->` Children's

`->` Children là danh từ số nhiều `->` không thêm s

`29`. picks `->` is picking

`->` HTTD, dấu hiệu: Look!

`->` Khẳng định: S + am/is/are + V-ing

`30`. on `->` in

`->` in + màu sắc