Is the use of a verb-ing still correct after a comma when the subject is changed?

Question

I know that usually we use verb-ing after a comma to say the action before the comma and that after the comma happen simultaneously. (e.g. The figure for bananas continued to grow, overtaking that for apples.)But is the verb-ing still correct when there is another subject after the comma?I saw a sentence in an IELTS writing textbook: "Most people in both years said their relationships with their supervisors and co-workers were either very good or good, the figure for very good raising from 63% to 70%."I find this sentence quite strange because I think there should be a "with" after the comma to make it grammatically correct but I am not sure.Could someone help me with this sentence and tell me whether it is grammatically correct or incorrect? And what are the rules behind your judgement?

Answer 1

Hey how are you, that's a tricky sentence. It's important to know that this sentence is grammatically incorrect. There are a few things wrong with it that make it confusing, but to answer your question, after the comma you would use a conjunction or subordinate conjunction (and, or, but/ which, because etc..). The reason is the comma you are talking about is separating two sentences. "With" is a preposition and commas are not used for single prepositions. Hope this helps, if you have more questions please message me.