Student B, cover the dates. Student A, ask Student B when the things in the picture in 1b were invented. Then change roles and practice again.
When was the telephone invented?
I think it was invented in 1876.
1. invent v. 发明
Edison invented the light bulb.
invention和inventor都是名词, 前者意为“发明”, 后者意为“发明家”。
discover, invent和find都是动词, 它们的词义相近, 但是有区别:
The lost bike was discovered at the bus stop.
Later I discovered that he was so kind.