Chia động từ trong ngoặc

Chia động từ trong ngoặc 
1. Shh ! They (study) English
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2. What you (do) now ? 
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3. Would you like (have) some tea ?
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4. The children should (drink) milk 
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5. They (not go) go to school on Sundays
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6. She (have) a cat , but she (not have) a dog 
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7. there (be) 20 classes in your school ?
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