为什么“Are they healthy food and drinks?”中的food没有加s,而drink却加了s?ps：前面没有任何句子影响

英语急诊!I like fish and tofu.是用They are healthy.还是It is healthy.为什么,说说原因, They are healthy 改为同义句如题 I like fish.____Fresh and healthy.横线上填They are 还是Itis.为什么 She likes carrots (because they are healthy food) I like cabbages.They are very healthy.用why提问 I like vegetables because they are fresh and healthy是什么意思 They are tasty and healthy.改成否定句 My grandparents always e____in the morning,so they are healthy i eat lots of vegetables because they are healthy 对划线句子提问 because they are healthy My grandparents are in good___.They have___food and drink every day.A.healthy,healthB.health,healthC.healthy,healthyD.health,healthy The food and the oil they use （are/is） not clean or healthy enough.这里应该用are还是is,为什么? my grandparents are still healthy ,（）they are over eighty years oldmy grandparents are still healthy ,（a_____）they are over eighty years old they give me energy ,but they are not healthy /__ 横线上还可以填什么 为什么“Are they healthy food and drinks?”中的food没有加s,而drink却加了s?ps：前面没有任何句子影响 fruit and vegetables are healthy food 为什么food用单数? They are helpful to your _____.They are ____ food.(healthy)有助于回答者给出准确的答案 where are they为什么要用they 该一般疑问句 They think sports games are good for healthy