Englishfor English speakers
it's
Contraction
—
The contraction of "it is".
Bring you coat. It's raining.
"Where's the book?" "It's on the teacher's desk."
"What's that?" "This? It's just a piece of paper."
—
The contraction of "it has".
It's been a long time since I've had cake.
an
Determinative
—
An (or a) is used when the following word could be any of a certain type.
I just ate an apple.
It is indeed an honor to have met you today.
emergency
Noun
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An emergency is a serious situation that needs to be dealt with very quickly.
She called 911 to report the emergency to police.
With the new fighting, the president has declared a state of emergency.
He was rushed to the emergency room where doctors operated to save his life.
Some airlines failed to show pilots how to operate emergency exits.
In an emergency, please close your doors and windows and stay calm.
—
Emergency is the department in a hospital that takes people with immediate medial needs.