sentence: We should think of a better future and try to be environmentally friendly - try to avoid the huge amount of pollution which is caused by cars and not think only of our comfort .
modified: We should think of our better future and try to behave environmentally friendly - try to avoid the huge pollution , which is by cars caused and do n't think only to our comfort .
transformation: DET, VERB, OTHER, PUNCT, WO, OTHER, PREP