He deals with the negative aspects of the french revolution.
D. Teacher has underestimated the son.
The teacher has labeled the son as a "slow learner" and the father is arguing that that is not true.
Sometimes my computer breaks when I need it most and I find it very bothersome. It is not efficient for me to be able to do my homeworks. I am unable to search information from the internet. Therefore, my computer is not working its best for my personal use. It is serving me inefficiently.