Usually, Whenever I insert other words (for example, adverbs) between modal verbs and the verbs coming after them, Microsoft Word asks for revising in the order of words. Is that insertion incorrect grammatically or style-wise?
It is not clear if that may, as an independent factor, affect the value.
I know that writers are advised to avoid split infinitive, but it is not grammatically incorrect and one may do it when there is no other way. Is is the same about insertion between modal verbs and the verbs after them?