in my opinion,copying others' homework is not good,because it's against the rules of the school.we should be honest and work hard to get high scores.if we have difficulties,we can even ask the teacher or our classmates for their help.
now it is common that students copy homework from their classmates. i think it is a terrible thing . because homework is their own task and the check for what they learn in class. if they copy others' homework , the teachers won't get the fact so they can't help the students to improve. besides ,if the students can't finish their homework, they can't get the chance to go over their lessons so they can't make progress. so don't copy others' homework.