[thaumasiotes]

> you should all speak Chinese now, whose words don't change forms at all

There are some inflectional elements in Chinese.

Speaking for Mandarin:

- Verbs may be inflected into one of three aspects, with the suffixes 着 (progressive), 了 (perfective), or 过 (experiential).

- Certain verbs may be inflected for possibility or impossibility, with the infix 得 (for possibility) or 不 (for impossibility). If the verb is not naturally part of the category that participates in this construction, the dummy particle 了 (which shares spelling, but not pronunciation, with the perfect suffix mentioned above) must be supplied, to convert it into that category.

- Nouns may be inflected for plurality with the suffix 们. As I understand it, this is only really appropriate where the noun refers to a collection of people (broadly defined), but any such noun may receive the suffix.