These three ugly ducklings are on the water.改为单数句
These three ugly ducklings are on the water.改为单数句
These ducklings are on the river.(否定句)
Are these ugly ducking swimming in the pond?改成单数句
Are these nice pictures 改为单数句
These are his brothers 改为单数句
These are yellow purses.(改为单数句)
These are dishes 改为单数句
These are my pencils改为单数句
These are his watch.改为单数句
are these old coats 改为单数句
These are boxes. (改为单数句)
These are apple trees(改为单数句)