11.   Birds chirp in the trees.

12.   A bird chirps in the distance.

13.   A bird chirped.

14.   Downstairs, birds chirped in their cages.

15.   Her friends teased that when she woke in the morning, birds chirped around her.

16.   On his way to park, birds are chirping.

17.   On the naked branches above her head, birds were chirping.

18.   Outside my window, birds chirped, then the snow of my childhood returned, then the birds came back.

19.   The birds are chirping.

20.   The birds were chirping.