Using modus ponens or modus tollens, complete the following arguments.

1. If this student is honest, she will not try to cheat when she takes a test.
   This student tried to cheat on a test.
     ___________________________________ by modus ______________
   
   
2. If it is raining today, I will take my umbrella.
   It is raining today.
   _____________________________________  by modus _______________
   
   
3. (ab) cb
   ________________________________  by modus _______________
   
4. I always bring my lunch on Monday.
   I will buy my lunch today.
   _____________________________________   by modus _______________