These are apples变成单数形式

These are apples变成单数形式 These are apples改为单数形式 these are apples 改为单数形式 are these apples?改为单数形式 these are apples怎么变单数 These are our apples改为单数 these are our apples改为单数句子 these are apples and those are pineapples(改为单数 There are some apples.（变成单数句子） she is nurse (改为复数）What are those over there?(改为单数）These are apples and those are pineapples(改为单数)They are waitresses (改为单数)They are oranges (改为单数)They are apples (改为单数) How much are these exercise books?(变成单数句) 改为单数句These are apples Those aren it any oranges they are apples改为单数 Are those apples 改为单数 these apples are good for THESE apples are sweet感叹句 How many apples are these these are apples变单数句子和they are ——dragonboats——对花线部分提问