Ex 4:
1. Cows are fed in Ba Vi
2. These hospitals were built during the war
3. A new skirt was made by Lien yesterday
4. Flowers are being planted in Da Lat
5. Some fruit trees has just been planted Mr Bao
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Ex9:
1. will visit
2. will buy
3. will/ go
4. won't plant ( will not plant, có thể ghi 2 cách nhé )