1/ Are they your sisters ? Yes, they are.

2/ Where is Lan ? She is in the house. No, she isn't. She is in the garden.

3/ This isn't ny school bag. That is her school bag.

4/ Are those her schools ? Yes they are.

5/ What are they ? They are nurses.

6/ Who are Hoa and Hai ? Hoa is my sister and.....

$1)$ $are$ - $are$

$2)$ $is$ - $is$ 

               - $isn't$  - $is$

$3)$ $isn't$ - $is$

$4)$ $are$ 

        $are$

$5)$ $are$

        $are$

$6)$ $are$

        $is$