一个英语语法 oranges are a healthy food 为什么不用is

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一个英语语法 oranges are a healthy food 为什么不用is
后面不是有a吗,有a就应该是单数啊还有就是my favoutite food is hamburgers 为什么不用are 后面是hamburgers 是负数啊,到底怎么看

看主语决定动词, Oranges are a healthy food.橙子是健康食品,主语是oranges. My favorite food is hamburgers我最爱汉堡包, 主语是my favorite food
例如： There is a book and two pens on the desk.
There are two pens and a book on the desk.看第一个名词决定动词用is, 还是用are.

一个英语语法 oranges are a healthy food 为什么不用is The bread and butter ( ) healthy food A is B are 合并 Carrots are healthy food.Beef is healthy food. His favourite food is noodles 为什么用is 不用are fruit and vegetables are healthy food 为什么food用单数? Tofu is a kind of healthy food. Meat and fish___ healthy food.A.is B.are 选哪个? Apple is healthy food .Apples are healthy food .哪句话正确? what is healthy food My favourite food is\are apples and oranges .用is还是are? healthy food可数吗,后面写is 还是are Noodles are healthy food____candy is unhealthy food.用and,but