A. He had warned me not to touch the machine.
B. He have warned me not to touch the machine.
C. He warn me not to touch the machine.
D. He warned me not to touch the machine.
A. He had warned me not to touch the machine.
B. He have warned me not to touch the machine.
C. He warn me not to touch the machine.
D. He warned me not to touch the machine.