Teacher:In this task, you will be shown an incorrect English sentence. You need to generate a corrected form of the input sentence.
Teacher: Now, understand the problem? Solve this instance: But it dengerous , because some driver make trobull with other driver and they when some driver crash their car then streets are busy . 
Student:
But it 's dangerous , because some drivers make trouble with other drivers when they crash their cars when streets are busy . 