Editing Solresol/Grammar

Apart from stress and length, solresol words are not inflected. Word order is also rather strict.

Solresol marks feminine gender and plural number, by stressing or lengthening the last syllable a word:

resimire brother, resimiré sister. 
resimiree brothers, resimiréé sisters

This only affects the first word in a noun phrase. That is, it only affects a noun when the noun is alone, as above; any determiner ('the', 'my', etc.) will take the gender or number marking instead:

redo resimire my brother, redó resimire my sister. 
redoo resimire my brothers, redóó resimire my sisters

Parts of speech are derived from verbs by lengthening (or perhaps stressing; the description is not clear) one of the syllables: abstract noun (1st syllable), agent/doer (2nd syllable), adjective (penult), adverb (last syllable). For example,

midofa to prefer, miidofa preference, midoofa preferable, midofaa preferably. 
resolmila to continue, reesolmila continuation, resoolmila one who continues, resolmiila continual, resolmilaa continually

Questions are formed by inverted subject and verb.

The various tense-and-mood particles are the double syllables, as given in vocabulary above. In addition, passive verbs are formed with faremi between this particle and the verb. The subjunctive is formed with mire before the pronoun. The negative do only appears once in the clause, before the word it negates.

The word fasi before a noun or adjective is augmentative; after it is superlative. Sifa is the opposite (diminutive):

fala good, fasi fala very good, fala fasi excellent, the best; sifa fala okay, fala sifa not very good (and similarly with lafa bad)
sisire wind, fasi sisire gale, sisire fasi cyclone; sifa sisire breeze, sisire sifa movement of air