2 If I had a bottle, I would send a message. (unreal present)
3 If I had saved the radio transmitter, I would have called for help. (unreal past)
4 If there weren't too many sharks, I would escape. (unreal present)
5 If I had company, I wouldn't feel lonely. (unreal present)
6 If I make an axe, I'll be able to make a raft. (real present)
7 If I hadn't lost my knife in the water, I would have cut the branches down. (unreal past)
8 If nobody finds me, I'll die on this island. (real present)