6. 4)has never been 5)have known
7. 3) he has never built a house
4)they have just walked in the park
5) Kate is a long time in bed
6) She hasn't eaten anything this morning
7)She hasn't seen her friends a week
8.1)haven't cleaned
2)haven't started
3)haven't done
4)hasn't won
5)haven't seen
6)haven't invited