Can somebody help me correct these sentences?

[scott833]

1) From what do you know that he is a good teacher?
2) From what do you see that makes you think he is a good person?

 

[cardboard]

1) How do you know that he is a good teacher?
2) What makes you think that he is a good person?
Please rectify any mistakes I have made. :lol:
*edited for typo error >.>

 

[tedtmc]

1) How do you know that he is a good teacher?
2) What makes you think that he is a good person?
Please retify any mistakes I have made. :lol:

Well done.
retify - rectify.