Q:Have Tim & Sue bought the maps yet?
A:They've bought two so far. They need to buy another three.
Q:Has Soraya checked the tents yet?
A:She's checked one so far. She needs to check another three.
Q:Has Adam had his injections yet?
A:He's had 1 so far. He needs to have another two.
Q:Have Sue & Joe booked the plane tickets yet?
A:They've booked six so far. They need to book another two.
