Question:
Based on the premise "You are very sure of his guilt?", can we conclude that "You think he is innocent."?
****
Answer:
no

Question:
Based on the premise "don't have to do anything", can we conclude that "But if you want, you can do something."?
****
Answer:
it is not possible to tell

Question:
Based on the premise "She asked- and just like that, her voice changed.", can we conclude that "Her voice changed when she asked."?
****
Answer:
yes