Englishfor English speakers
ascertain
—
verb
(= find)
establish after a calculation, investigation, experiment, survey, or study
find the product of two numbers
The physicist who found the elusive particle won the Nobel Prize
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verb
(= see, control)
be careful or certain to do something; make certain of something
He verified that the valves were closed
See that the curtains are closed
control the quality of the product
—
verb
learn or discover with certainty
—
verb
(= determine, check, find out, see, learn)
find out, learn, or determine with certainty, usually by making an inquiry or other effort
I want to see whether she speaks French
See whether it works
find out if he speaks Russian
Check whether the train leaves on time
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
price
Noun
—
The amount of money you need to pay to buy something.
The price of this book is ten dollars.