How many children （does） your uncle（ have）?为什么要用does和 have?

How many children （does） your uncle（ have）?为什么要用does和 have? How many d___ does your uncle have? How many sheep does your uncle have? How many d___ does your uncle have?● How many bedrooms does your flat have?为什么要用does .How many children does Mrs Brown have? how many children does Mr Green have? how many children does cage have How many (watch)does your father have Does Ann have （）uncle —How many ____ does your uncle have on his farm? —Twenty, I How many brothes does your uncle in his family?A.has B.have