The document discusses different grammar structures in Mandarin Chinese that involve aspect markers like 了 and 才. It provides examples of structures like V1(以後)就V2(了), which indicates one action following another; the use of 了 with quantified objects; using 到...才 to talk about lateness; and contrasting sentences with 才 and 就+了 to compare completing an action at different times. The document is a reference on several grammatical structures in Chinese involving aspect markers.