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Supply the Present Perfect Continuous Tense of the verbs in brackets.
1. She ... with us since then. (live)
2. How long ... the children ... (play) ?
3. He is tired. He ... all day. (dig)
4. She ... at this school for twenty years. (teach)
5. He ... experiments for a year. (make)
6. What ... you ... with yourself lately (do)?
7. I think she ... lies as usual. (tell)
8. I ... myself that question for many years. (ask)
9. You ... me since the very moment I left the house. (follow)
10. We ... our librarian to put the books in the right order for three days. (help)
11. He says he ... for a long time without achieving good results. (work)

1 She has been living with us since then.2 How long have you been playing the children? 3 He is tired. He has been digging all day.4 She has been teaching at this school for twenty years. 5 He has been making experiments for a year .6 What have you been doing with yourself lately?7 I think she has been telling lies as usual.8 I have been asking myself that question for many years. 9 You have been following me since the very moment I left the house. 10 We have been helping our librarian to put the books in the right order for three days. 11 He says he has been working for a long time without achieving good results.