formulate

kehitellä

muodostaa

selittää

laatia kaavan mukaan puhekieltä To reduce to, or express in, a formula; to put in a clear and definite form of statement or expression.
(quote-book)

Another source of evidence supporting the conclusion that children learn language by formulating a set of rules comes from the errors that they produce. A case in point are overgeneralized past tense forms like comed, goed, seed, buyed, bringed, etc. frequently used by young children. ...