I need your help to correct these English sentences. 6. 除此之外，歌曲的难度应该等同于学生的认知水平。 ——In addition, the difficulty of songs should be equal to the pupils’cognition level. 7. 如果歌曲的难度很大，会影响小学生学习英语热情和兴趣。如果歌词太简单，不利于提高词汇量，那将不能达到扩大小学生词汇量的目标。 ——If the songs have great difficulty for pupils to learn, which will impact on pupils’ enthusiasm and interest for learning English; if the lyrics of songs are easy, it isn’t good for improving the number of vocabularies, that can’t reach to the goal of expanding pupils’ vocabulary. 8. 选择有趣的歌曲是非常重要的，这样可以吸引小学生的注意力。 ——Selecting interesting songs is very important, which can attract pupils’ attention. 9. 因此只有老师适当的使用反复操练，这样才有利于学生的学习。 ——So only teachers properly use repetition training to teach, which is good for pupils’ learning. 10. 和传统教学相比，小学生变得积极学英语。 ——Comparing with the traditional teaching, pupils become active to learn English in class. 11. 将歌曲运用于英语教学中，小学生不仅可以从课内课外学到单词，而且能够保持迟持久的记忆力。 ——Applying songs to English teaching, pupils not only learn the words from their books and out of their books but keep long memory of words.