Tham khảo ở đây B) Combine the following sentences by using AFTER / BEFORE
1 . My mother made a cake . The guests came.
My mother made a cake before The guests came.
2. He put sugar in his tea . He drank it.
Before he drank his tea, he had put sugar in it
3. I got up . I had breakfast.
Before i had breakfast, i had gotten up
4. The children ran away . They broke the window.
Before The children ran away, the had broken the window
5. I fastened my seat belt . The plane took off.
Before the plane took off, i had fastened my seat belt.
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