有没有看见一个蓝色书包用英语怎么说

Have you ever seen a blue schoolbag?

Have you seen a bule school bag?

(你)有没有看见一个蓝色书包？
Have you ever seen a blue schoolbag?
有没有（人）看见一个蓝色书包？
Is there anyone who has seen a blue schoolbag?

希望我的答案能够对楼主有帮助，呵呵^^

有没有看见一个蓝色书包？
Do you see a bule schoolbag?

Do you looking for a blue bag?

Have you(ever)seen a blue schoolbag?