When do you add es and s before the plural word ending in o?

Generally, es should be added to the plural form of nouns ending in o, but if there are vowels or foreign words before o, only s should be added to the abbreviations ending in o, such as: tomato-tomatos, hero-heroes；; Photo-photos, radio-radio, piano-piano \ r \ nThe plural forms of nouns ending in O usually add -es, such as heroes, tomatoes, potatoes, negro, dingos \ r \ nBut the plural forms of the following nouns only add -s, remember: piano piano piano, Photos, zoos parks, bamboos, radios radios, studios, cuckoos, solos solos, restaurants, kilos, discos discos, cellos \ r \ Some nouns also have plural forms. They are