海伦的书包在椅子上用英文怎么说

海伦的书包在椅子上用英语可以说成 "Helen's backpack is on the chair."

来源：这是一句普通的英语陈述句，由主语"Helen's backpack"、谓语动词"is"和宾语"on the chair"组成。

例句及翻译：

"Helen's backpack is on the chair." (海伦的书包在椅子上)
"The book is on the table." (这本书在桌子上)
"The cat is under the bed." (这只猫在床下)