Поставьте артикль,
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 formThe children we saw in the street are schoolboysShe lives in the 1st Street