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A/an/the, где НЕОБХОДИМО.
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#1

This is a clock
This is Kiev.
Kiev is a big city
Mary is a girl
She is my sister
This is a room
Is a newspaper in the bag?
She is in the room
Is a teacher in the classroom
Is your room large?
Is a pen in the bag?
Are you students?
My friend has children
The sportsmen are always in good form
The children we saw in the street are schoolboys
She lives in the 1st Street