我是英语老师,帮你归纳一下.
形容词比较级前加more,最高级前加most的情况：
1.多音节形容词.more popular
2.以-ful或-less结尾的形容词.more careful/carless
3.动词的现在分词或过去分词充当形容词.more tired ,more boring
4.频度副词前.more often
5.以-ly结尾的形容词前可加more,也可改y为i,再加-er.more friendly/friendlier
6.少数以-ly结尾的副词前.more slowly/quickly