John went to the hospital to have a checkup on eyesight.对to have a checkup on eyesight提问改为 ——did John go to the hospital——

John went to the hospital to have a checkup on eyesight.对to have a checkup on eyesight提问改为 ——did John go to the hospital——
John went to the hospital to have a checkup on eyesight.对to have a checkup on eyesight提问
改为 ——did John go to the hospital——

John went to the hospital to have a checkup on eyesight.对to have a checkup on eyesight提问改为 ——did John go to the hospital——
—What—did John go to the hospital—to do?—

Why did John go to the hospital?