They know that the children are playing in the garden.
- It is known that the children are playing in the garden
- The children are known to be playing in the garden.
They know that the children are playing in the garden.
- It ..is known that the children are playing in the garden..
- The children are known to be playing in the garden.
They know that the children are playing in the garden.
- It is known that the children are playing in the garden..
- The children is known to be playing in the garden.