为什么dancer.singer变动词形式.dancer去掉r而singer去掉er?

The singer and dancer ( )ou;r English evening. The singer and dancer ( )from Beijing The singer and dancer ( )our English evening. a singer and dancer和the singer and dancer什么区别? The singer and dancer is to attend our evening .用is to 而不用ar the singer and the dancer（）come to Beijing.为什么要选have,而不是are呢 Spanish、English、daughter、actress、singer、competitive、dancer、a 1.Singer and dancer ____(be) here now. The singer and dancer ____ to attend our evening party. 一道英语选择The singer and dancer _______our evening party the singer and dancer ___the party this evening He is famous in China___a dancer ,___a singer .