Since ancient times, sound and light have served people to transmit messages over long distances
At the beginning of its development, a person, warning his fellow tribesmen about danger or calling for hunting, gave signals by shouting or knocking. Sound is the basis of our speech communication. But if the distance between the interlocutors is large and the voice strength is not enough, auxiliary tools are required.
So man began to use whistles, animal horns, torches, bonfires, drums, gongs, and after the invention of gunpowder-shots and rockets
1)I go to school .
I don't go to school.
Do you go to school?
2)She reads a lot of books.
She doesn't read a lot of books.
Does she read a lot of books?
3)He went to the swimming pool.
He didn't went to the swimming pool.
Did he went to the swimming pool?
4)She played with her sister .
She didn't played with her sister.
Did she played with her sister?
5) I have seen this film.
I haven't seen this film.
have you seen this film?
6)She has written letter.
She hasn't written letter.
Has she written letter?
Since ancient times, sound and light have served people to transmit messages over long distances
At the beginning of its development, a person, warning his fellow tribesmen about danger or calling for hunting, gave signals by shouting or knocking. Sound is the basis of our speech communication. But if the distance between the interlocutors is large and the voice strength is not enough, auxiliary tools are required.
So man began to use whistles, animal horns, torches, bonfires, drums, gongs, and after the invention of gunpowder-shots and rockets