请教7年级英语

1.How many loaves of bread (are)there in the bridge?
2.There(are)two loaves of bridge in the fridge .
3.Two loaves of bread(are)in the fridge.
在有量词的情况下:a loaf of bread(单数)
some loaves of bread(复数)
无量词的情况下:不可数名词用is
可数名词为are+名词复数形式

您好！

1.How many loaves of bread ___is___there in the bridge? <is/are>
2.There__are_two loaves of bridge in the fridge .<is/are>
3.Two loaves of bread___are___in the fridge.<is/are>

be是”是”动词的总称，包括am,is和are.第一人称I用am,第二人称you用are,第三人称he,she,it或人名用is,复数全用are
所以
“who are you ”正确
who is William 正确

is跟不可数名词
are跟可数名词

be动词
be动词的用法
be
[bi:]
vi
现在时 I am, you are, he is, we are, you are, they are （缩略式 I'm, you're, he's, we're, you're, they're）, （否定缩略式 I'm not, isn't, aren't）, 过去时 I was, you were, he was, we were, you were, they were （过去时否定缩略式