Change to the plural. 1 That is a sheep
2 She has got a box
3 This is a man
4 There is a strawberry
5 that is an ostrich
6 There is a mouse​

Change to plural.
1 This is a sheep ... these are sheep
2 She has a box ... she has boxes
3 This is a man ... this is a man
4 There are strawberries there are strawberries
5 it's an ostrich it's an ostrich
6 There is a mouse ... there are mice