2. use the verbs in brackets in the present perfect continuous tense. 1. i (do) the housework since this morning. 2. david and mary (go) out together now for nearly five years. 3. we have no idea how long they (swim) for, but it has certainly been longer than an hour now. 4. how long (work) at the library? 5. just look at those trousers. what on earth (you/ do)?

1. I (have been doing) the housework since this morning.
2. David and Mary (have been going) out together now for nearly five years.
3. We have no idea how long they (have been swimming) for, but it has certainly been longer than an hour now.
4. How long (have they been working) at the library?
5. Just look at those trousers. What on earth (have you been doing)?