Potatoes are my favourite vegetables.vegetable是否要加s?

Potatoes are my favourite vegetables.vegetable是否要加s? Potatoes are my favourite改为一般疑问句 mangoes are my favourite fruit.fruit要加s吗 favourite,and,are,vegetables,fruit,my,这个句子为什么要组成,vegetables 连词成句 food ,potatoes ,favourite ,are ,my [ .] what are your favorite vegetable vegetable后要不要加s My favourite food is potato.还是My favourite food are potatoes my favourite food ( ) vegetables括号中填is还是are? favourite,and,are,vegetables,fruit,my.连成句子. 为什么Eat lots of fruit and vegetables中fruit不加s,而vegetable加s, potatoes are a vegetable.the potatoes are a vegetable .a pot potatoes are a vegetable the potatoes are a vegetable a pota