1、In autumn the leaves turn into（改：去掉into,不用介词） yellow.
2、I missed the last bus last night,so I must（改：have to,不得不） walk home.
3、The little girl dare not to（改：去掉to,用原形） go out alone in the evening.
4、He has bought（改：had,要用延续性动词） this dictionary for two years.
5、I'm looking for（改：up,查找单词） a new word in the dictionary.
6、The students are listening （改：加上to,listen是不及物动词） the teacher.