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I would like to tell you about Steven Hawking. He was born in England  8 01 1942. Both his parents had studied at Oxford. Both his parents had studied at Oxford. When he was 21, Stephen started tripping, dropping items and his speech became unclear. After a series of tests, doctors concluded that Stephen was suffering from ALS- Amyotrophic Lateral Sclerosis; a disease which paralyzed him and required a speech generating device to communicate. His most famous theory is that black holes can emit radiation; also known as Hawking radiation. Hawking has received numerous awards but never won the Nobel Prize. To my mind, it is so sad. I think, he made lots useful invention.

Объяснение:

1. Present perfect
I have done my homework already.
We have no classes today, our teacher has fallen ill.
Have you seen this film?
I haven’t seen him since then.
Has she come yet?
2. Past simple
I have finished reading “Dracula” this week.
I’ve studied Spanish since childhood.
I visited the Louvre last year.
She spoke to him in a low voice.
Did you see Jenny two days ago?
3. Past progressive
When you called I was taking shower.

Charlie and me were already driving home when the engine suddenly stopped.
Were you sleeping when I called?
In the morning our elevator was not working.
I was sleeping when someone knocked at the door.