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.
or
Conjunction
—
A word used to link two alternative choices.
Would you like tea or coffee?
not
Adverb
—
"Not" makes the verb of a sentence have the opposite meaning.
I was not there.
I am not fat!
not
Conjunction
—
The item before "not" is more correct or better than the item after "not".
I wanted tea, not coffee!
Meaning: I wanted tea. I did not want coffee.
It's stupid, not funny.
Meaning: It is stupid. It is not funny.
not
Interjection
—
Used to indicate the sentence before is sarcastic or ironic. This means that the sentence has the opposite meaning.
I like doing lots of boring homework. Not!
Meaning: I do not like doing lots of boring homework.
b
Noun
—
B is the second letter of the alphabet.
"b" comes after "a" but before "c"
—
In some schools, a B is a fairly high grade.
Charles got a B in his maths test.
gate
Noun
—
A gate is like a door in a fence. It opens to let people go through the fence.
Please open the gate for me; my hands are full.
—
In computers and logic, a gate is something that gives a simple yes-or-no answer from two (or one, or more than two) yes-or-no things coming into it.
We need one more "and"-gate here so that it will give the finished answer.