Từ loài người nguyên thủy đến xã hội có giai cấp, loài người phải trải qua các chế độ xã hội nào?

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A Rewrite sentences using if (type 2 conditional) 1. I’m not rich, so I don’t live in a big house. ……………………………………………………………………………………………… 2. We don’t visit you very often because you live so far away. ……………………………………………………………………………………………… 3. Sandra can’t take a photo because she hasn’t got her camera. ........................................................................................... 4. She buys a lot of clothes, so she has no money. ……………………………………………………………………………………………… 5. I have to work tomorrow evening, so I can’t meet you. ……………………………………………………………………………………………… 6. It’s raining, so we can’t have lunch in the garden. ……………………………………………………………………………………………… 7. I’m often tired in the morning because I go to bed late. ……………………………………………………………………………………………… 8. We haven’t got a calculator, so we can’t work this out quicker. ……………………………………………………………………………………………… 9. Nick can’t find the way because he hasn’t got a map. ……………………………………………………………………………………………… 10. David has so many accidents because he’s so clumsy. ……………………………………………………………………………………………… 11. I don’t write to my friends because I’m so busy. ……………………………………………………………………………………………… 12. Susan hasn’t got a watch, so she’s often late for work. ……………………………………………………………………………………………… 13. He coughs a lot because he smokes forty cigarettes a day. ……………………………………………………………………………………………… 14. They don’t have a garden. They don’t grow vegetables. ……………………………………………………………………………………………… 15. I don’t have a boat. I won’t sail around the world. ……………………………………………………………………………………………