Englishfor English speakers
by
Preposition
—
near or next to.
The mailbox is by the bus stop.
—
at some time before (the given time).
Be back by ten o'clock!
—
if something is done by somebody, it is done through their action
The matter was decided by the chairman.
The boat was swamped by the water.
He was protected by his body armour.
—
if something is created by somebody, they are the creator, author, etc.
There are many well-known plays by William Shakespeare.
—
shows how someone does something
I avoided the guards by moving only when they weren't looking.
—
using the rules or logic of.
I sorted the items by category.
—
with a change of. In this case, by shows how much something has changed.
Our stock is up by ten percent.
—
shows how slowly, or how quickly, someone does something (used in the form "X by X" or "by Xs")
We went through the book page by page.
We crawled forward by inches.
—
If you multiply mathx/math by mathy/math, you multiply mathx/math × mathy/math.
Five multiplied by seven is 35.
—
If you divide mathx/math by mathy/math, you find how many mathy/maths are in mathx/math.
35 divided by seven is five.
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.
chalk
Noun
—
Chalk is a soft, white, powder-like limestone.
The men mine chalk in the hills near my house.
—
Chalk is a piece of chalk, or more usually, processed compressed chalk, that is used for drawing and for writing on a blackboard; teachers at school may use chalk to write on a blackboard.
John wrote his name on the blackboard with chalk.
There are many pieces of chalk on the floor.
The shop at the corner of the street sells many chalks.
chalk
Verb
—
To put chalk on something, such as the tip of a billiards cue.
—
To write something using chalk; this is often done on a blackboard.
—
To use powdered chalk to put the lines on a sports field.