Englishfor English speakers
known
Adjective
—
If something is known, people know about it; it is famous.
It is a known fact that water freezes at 0°C.
She is known for all the volunteer and charity work that she does.
known
Noun
—
In algebra, a variable or constant whose value is already determined.
—
Any fact or situation which is well-researched or familiar.
him
Pronoun
—
he when used after a preposition or as the object of a verb.
Give it to him (after preposition)
She wrote him a letter (indirect object)
She treated him for a cold (direct object)
for
Preposition
—
shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
—
For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
—
For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.
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.
long
Adjective
—
If something is long, it takes a lot of time.
At 3 hours and 24 minutes, it's a very long movie.
That was a long time ago, when I was a child.
How long is it until we have our trip?
He was often quiet for long periods of time.
—
If something is long, it has a large distance from end to end.
It belonged to a woman in her thirties with long brown hair.
The paper was about 20 cm long and 12 cm wide.
You can hear it across long distances.
She wore a long gray skirt with a black jacket.
long
Adverb
—
If something takes long, it takes a lot of time.
We had dinner together not so long ago.
I do not know how long I was standing there.
She left home long before I did.
I could not go on any longer.
Those days are so long gone.
This change is long overdue.
long
Verb
—
If you long for something, you wish for or really want it.
Carol still longs for David to come back to her even though she knows he has a new wife.
time
Noun
—
Time is what we measure with a clock.
"What time do you finish work?" "At four o'clock (4:00)."
I don't have time to talk to you right now. Can we do it later?
—
If you do something one time, you do it once.
time
Verb
—
If you time something, you measure how long it takes in seconds, minutes, hours, etc.
Take out your watch and time yourself during the test.