Example: you`re not right. (think) - i don`t think (that) you`re right. 1. it wan`t an explosion. (think) 2.they weren`t humans. (believe) 3. james hasn`t got an alibi. (think) 4.scientists can`t explain their disappearance. (believe)

1 I don't think that it was an explosion.
2. I don't believe they were humans или I believe they were not humans
3. I don't think James has got an alibi
4. I don't believe scientist can explain their disappearance. Или I believe scientist can't explain their disappearance