This used to confuse me until I sat down and worked it out. The one thing I found the hardest was why we, as writers are being dictated to as to the best way to write. But it makes such a difference. Just look at these two sentences and the position of the subject in relation to the verb.
I’m not going to get into the nitty gritty about verbs and subjects. Let’s just say that if the subject acts on the verb it’s active as in Jane singing.
And the most important of all?