Write negative and interrogative forms of the following sentences

1) Jenny is helping her mother now. 2) We are meeting the guests now. 3) It is getting dark. 4) You are preparing for the conference at the moment. 5) The sun is appearing in the sky. 6) His friends are waiting for him in the yard. 7) I am washing the dishes now. 8) Martin and Fred are swimming in the pool. 9) The teacher is explaining the rule now. 10) Some people are crossing the street.