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IV / rewrite the tense
1. I started going to work by bus 3 months ago
-> i have...
2. Don't drink coffee oe you won't be able to sleep
-> if ...
3. We last visited Nha Trang city in 1988
-> we haven't...
4. Stop polluting the rivers or we will have no fresh water to use in a few decades
-> if...
5. Study harder or you will fail in the next examination
-> if...
6. The last time they saw their uncle was three years ago
-> they haven't...
7. If it doesn't rain tomorrow, we will go on a picnic
-> unless....
8. If i am not busy this evening, i will help you do the homework
-> unless...
9. Unless you study harder, you cangot pass the exam
-> if...
10. She will miss the train unless she comes before 10 pm
-> if..
IV / rewrite the tense
1. I started going to work by bus 3 months ago
-> i have.gone to work by bus for 3 months..
2. Don't drink coffee oe you won't be able to sleep
-> if .you drink coffee , you won't be able to sleep..
3. We last visited Nha Trang city in 1988
-> we haven't..visited Nha trang city since 1988.
4. Stop polluting the rivers or we will have no fresh water to use in a few decades
-> if.you pollute the rivers , we won;t have no fresh water to use in a few decades ..
5. Study harder or you will fail in the next examination
-> if.you study hard you will pass in the next examination..
6. The last time they saw their uncle was three years ago
-> they haven't.seen their uncle for three years..
7. If it doesn't rain tomorrow, we will go on a picnic
-> unless..it rains tomorrow , we will go on a picnic..
8. If i am not busy this evening, i will help you do the homework
-> unless..i am busy this evening , .i will help you do the homework
9. Unless you study harder, you cangot pass the exam
-> if..you you study harder, you can pass the exam.
10. She will miss the train unless she comes before 10 pm
-> if.she doesn't come before 10 pm, She will miss the train