My little son _____ out alone at night. 

The little girl _____ go out at night and often imagined _____ a monster following her

 I would have come earlier, but I ________ that you were waiting for me. 

So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ . 

No student ______go out of school after eleven o’clock at night without the teacher’s permission.