变位
名词,复数 (Noun, plural): buses, busses
名词,单数或不可数 (Noun, singular or mass): bus
动词,过去时 (Verb, past tense): bused, bussed
动词,过去分词 (Verb, past participle): bussed
动词,动名词或现在分词 (Verb, gerund or present participle): busing, bussing
动词,第三人称单数现在时 (Verb, 3rd person singular present): buses, busses
动词,原形 (Verb, base form): bus
动词,非第三人称单数现在时 (Verb, non-3rd person singular present): bus