Sometimes, for quotations to make grammatical sense in your sentence, it is necessary to insert extra information. Use brackets (not parentheses) to add any necessary verbs or phrases to the quotation.
According to one critic, “Sondheim’s musical classic, Into the Woods, [weaves] a seamless fusion of fairytales that strikes at the child’s heart within us all.”
Remember, whenever you use quoted material, integrate it into the natural grammar of your sentence. Avoid free-floating quotations; instead, connect quoted material grammatically to your own writing. The integrated sentence should sound like a single, coherent sentence when read aloud (i.e. consistent verb tense, singulars and plurals etc.), not like two separate sentences jammed together.