Englishfor English speakers
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.
least
Determiner
—
the smallest amount of; little of
She does the most cleaning, but the least cooking.
No German, least of all the East Germans, wanted Soviet troops to stay.
least
Adverb
—
Having the smallest amount of a characteristic in a group.
People are least likely to live in the far north.
The phone always rings just when you least expect it.
least
Adjective
—
The least is the smallest amount.
There are at least four problems with the idea.
The power is least in this case.
The least difference is still important.
Nobody works hard, but she does the least.
He was not the least bit interested my ideas.
This accident is the least of our problems.