Правило: since и for.
В каждом предложении выберите подходящий по смыслу предлог (since или for).Например: We've been working here (since / for) this morning. – We've been working here since this morning.
1. We've been friends with Fred sincefor decades.
2. My boss has been away sincefor half a day only.
3. We haven't seen Mary sincefor the party.
4. They haven't visited us sincefor Christmas.
5. She has been in hospital sincefor Monday.
6. They have been ill sincefor Monday.
7. Dinosaurs have been extinct sincefor over 60 million years.
8. He's been working in the field sincefor early this morning.
9. John and Bob have been working on this project sincefor five months already.
10. They've been teaching here sincefor quite a long time.
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