bottles,of,milk,need,they,do,many,how.(连词成句)

问题描述:

bottles,of,milk,need,they,do,many,how.(连词成句)
回答最好带上讲解,

How many bottles of milk do they need?
他们需要多少瓶牛奶?请讲一下怎么讲哟How many 常在一起:多少How many bottles of milk :多少瓶牛奶they need他们需要,do是问句中的助动词,