W: Did you hear the thunder last night
M: Did I It was really loud.
W: I didn’ t see any lightning, though. I thought that thunder and lightning always occur at the same time.
M: They do. It’ s no possible to have one without the other since thunder is a direct result of lightning.
W: Really
M: Yes. Thunder is caused by the rapid expansion and contraction of highly heated air along the path of an electrical discharge.
W: In other words, lightning quickly heats the air and causes thunder. But if the lightning is there, why can’t we see it
M: Because it sometimes occurs very high in the clouds.
W: I wonder if it’ s possible to see the lightning and not to hear the thunder.
M: Yes. It’ s possible if the lightning flashes far enough away. Sound doesn’ t travel as far as light.
W: Good morning, Mr. Smith. Did you sleep well last night after your long flight
M: Good morning. Yes, I did. I feel totally rested and I’m now ready for our meeting.
W: Did you hear of the robbery in the bank last night
M: No, I didn’t. Which bank was robbed
W: The bank in Green Street.
M: How much money was lost
W: No a penny was robbed.
M: Really
W: Yes, there were three robbers. One was trying to run away, but the police shot him in the leg and they arrested him.
M: What about the other two
W: The other two were shot dead when they fired at the police.
M: Who called the police when the bank had been robbed
W: A brave security guard of the bank.
W: When your grandfather died in 1987, did you graduate
M: I finished school a year before he died.
M: You look tired. Where did you go last night
W: I planned to watch a film, but I went to meet my friend at the airport.
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