Spanish Grammar/Masculine and feminine endings, guidelines

In Spanish, all nouns are either masculine or feminine. Masculine nouns ultilize the singular article el, and the plural article los. Feminine articles utilize the singular article la and the plural article las. Nouns ending in -o are usually masculine. Nouns ending in -a are usually feminine. Endings Masculine Endings Nouns that end in -o, -ma, -pa, -ta, -l, -n, s, -aje, or an accented vowel are usually male. El libro The book El teléfono The phone El huevo The egg El vestido The dress –ma, -pa, or –ta El papa The PopeEl sistemaThe systemEl planetaThe planet –l, -n, -r, and singular nouns that end in -s El arbol The treeEl atúnThe tunaEl rencor The resentmentEl autobusThe bus -aje El viajeThe tripEl porcentajeThe percentageEl equipajeThe equipmentEl personajeThe character Ending in an accented vowel El colibríThe hummingbirdEl bambúThe bambooEl menúThe menuEl caféThe coffee