The rudiments of language

Louka is getting pretty good at talking (as she should be) and understands much of the structure of English. She knows how to make past tenses (add -ed), how to make comparatives (add -er) and how to make some verbs (add -en, as in shorten, darken etc). Of course, her grasp of these "rules" doesn't always guide her right. Strong verbs are a pitfall: she's just as likely to say "I falled" as "I fell". She informed me the other day that one activity would be "funner" than another. And this morning, she'd pretended to make something very big (by magic) but then she needed to "smallen" it again. Smallen is such a lovely word I had to check the dictionary ― but it wasn't there.