Compounds of ではないか

• ではないか
  (exp) (1) questioning (something)
  (2) let's do (something)
  (P)
• ないのではないか
  (exp) I think (something) won't (something)
  probably (something) isn't (something)
• しないのではないか
  (exp) I think (something) won't (something)
  probably (something) isn't (something)
  (P)