Graham Bell invented the first telephone. A. The first telephone had been invented by Graham Bell.
B. The first telephone could be invented by Graham Bell. C. The first telephone used to be invented by Graham Bell.
D. The first telephone was invented by Graham Bell. D. I will need to ask my elder brother if the homework is difficult.
34. The homework is not difficult, so I don't need to ask my elder brother. A. Unless the homework is easy, I will need to ask my elder brother.
B. If the homework was easy, I wouldn't need to ask my elder brother. C. I would need to ask iny elder brother if the homework were difficult.
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