xercise (4): Use 'has/have been' and the verbs given in the brackets to write the given sentences into present perfect progressive tense. 1. He (work) hard. That is why he looks tired. 2. The tree (lie) there for a month. 3. How long (wait) for the train ? 4. Since when you (do) this job ?
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Answer:
1 he have been working hard
2 the tree have been lie there for a month
3 how much have been waiting for train
4 since when you have been doing this job