英语问东西多大怎么说

To ask about the size of something in English, you can use the phrase "How big is it?" or "What is its size?" For example, if you want to know how big a book is, you can ask "How big is the book?" or "What is the size of the book?" You can also use specific units of measurement, such as "How long is it?" or "How tall is it?" if you want to know the size in a specific dimension.