There's some lettuce and some cucumber.lettuce和cucumber为什么不用复数形式呢?可是他们都有复数形式啊？

There's some lettuce and some cucumber.lettuce和cucumber为什么不用复数形式呢?可是他们都有复数形式啊？ there‘s (some)juice in the box? There are some s( ) in the factory mix some meat,lettuce and salt.mix some flour and water.knead some dough.翻译 There are some shoes over there.The new_____are Mike's. What's inside the bottles? There's some water inside____. 在教室里,用句型There's There's some There are some在教室里,用句型There's There's some There are some 写六句话 my father like some beef and some lettuce because they are my f( ) there's some water.即然这句里有some,为什么不用there're,而用there's的单数形式呢? Put some ____ and beef ____ on the bread.Put some ____ and beef ____ on the bread.A.lettuce,slice B.lettuces,slices C.lettuce,slices there's some bread in the fridge改为一般疑问 there's some bread in the fridge改为一般疑问 there's some bread in the fridge否定回答 There's some things you just can't change 改错 There's some bottles of juice on the table there's some ride in the bowl改为一般疑问句 There is some interesting news in today's n. 改错 There is some chesses in the teacher's office