I teach the homework, sister sister, because you do not understand the content and makes it easy to understand the content better than good friends and still stripping burden mother. mother has more leisure time.
I taught the house with her sister because her sister did not understand and help me understand better than stripping friends and relieving her mother too had more leisure time.
I teach you your homework with my sister because my sister don't understand the content and help you understand the content better than placebo friends and also lessen the burden on the mother also makes me more time to rest