All of the following word groups show parallelism except <span><u>smiling at my mother, when I cleaned my room, to ask my parents for a favor.</u> Parallelism refers to the usage of the same form throughout a sentence or a list of phrases. You can see that A, B, and D all have the same form in all of these examples, whereas in C they vary.</span>
I think this sentence would be better if we put an additional 'the' before the word 'students' So the sentence will become : it could be dangerous to carelessly teach grammar to the students
