she the window open now (用现在进行)

she the window open now (用现在进行)
She is opening the window now.
she is closing the door now(改成否定句)
She isn't closing the door now.
they the tree sing now under(用现在进行时连词成句)
They are singing under the tree now.
the Young Pioneers are heiping the oid woman(改成一般疑问句)
Are the Young Pioneers helping the old woman?

1.she is opening the window now
2.she isn't closing the door now
3.they are singing under the tree now
4.Are the Young Pioneers helping the old woman?