первая часть.
can you stand on your head
I could when I was at school but I can't now.
Could I smoke here? – No, you can't
can you type? Yes, I can type but I can't do shorthand
May I come in?
Where can I buy fruit?
He couldn't answer the teacher's question yesterday, but he can answer the same question today.
When I first came to Spain, I could not read Spanish, but I could speak it.
He said that we can use his flat whenever we liked.
There was a lot of noise in the street last night, and I could sleep.
The boys can't wait for him, they have no time for that.
Объяснение:
Any list of the greatest thinkers in history will contain the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einsteins work led to such scientific advances as the control of atomic energy and to some of the investigations of space. Einstein was born in Ulm, Germany, on March 14, 1879, of Jewish parents. He was a shy and curious child. He attended a Munich elementary school where he showed an interest in science and mathematics but did poorly in other areas of study. He finished high school and Technical College in Switzerland. In 1905, at the age of 26, he published five major research papers in an important German physics journal. He received doctorate for the first paper. Publication of the next four papers forever changed mankinds view of the universe. One of his papers laid the foundation for the photon, or quantum, theory of light. Television and other inventions are practical applications of Einsteins discoveries. In his works Einstein showed that time and motion are relative to the observer, if the speed of light is constant and natural laws are the same everywhere in the universe. His fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula E = mc2, known as the energy-mass relation. In 1916 Einstein published his general theory of relativity. World-wide fame came to him in 1919 when the Royal Society of London announced that his general theory of relativity had been confirmed. He was awarded the Nobel Prize for physics two years later. In 1940 he became an American citizen. Einstein died in Princeton, on April 18, 1955.