1
Do aliens exist?
To ask this, sign 'ALIEN' followed by 'EXIST'. Since it is a yes/no question, remember to raise your eyebrows and lean slightly forward while holding the sign for 'exist' at the end of the sentence.
2
I know ghosts exist.
Sign 'ME', 'KNOW', 'GHOST', and then 'EXIST'. Use a firm, confident nod when signing 'exist' to emphasize your certainty that they are real and present in the world.
3
Dinosaurs no longer exist.
Sign 'DINOSAUR', 'NOW', 'NONE', or use 'EXIST' followed by a negative sign like 'FINISH' or 'GONE'. This shows that their presence in the world has come to an end.