For many years scientists tried have been trying to define the nature of human intelligence. However, they have been unable to agree on whether there is one kind of intelligence, or several kinds. In the early 20th century, psychologist Charles Spearman came up with the concept of ‘g’ or ‘general intelligence’. He gave subjects a variety of different tests and found that the people who performed well in the tests used one part of the brain, which he called ‘g’, for all the tests. More recently, research has found that this idea may well be true, as one part of the brain (the lateral prefrontal cortex) shows increased blood flow during testing. However, some scientists believe that intelligence is а matter of how much people have learned rather than some ability they are born with. They believe that environment also matters.
They weren't in Rio last summer.We hadn't any money.
We didn't have time to visit the Eiffel Tower.
We didn't do our exercises this morning.
Were they in Iceland last January?
Did you have a bicycle when you were a boy?
Did you do much climbing in Switzerland?
I was in Japan last year
She had a headache yesterday
.We did our homework last night.
He went to a club last night.