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hatriu
2 năm trước
Cho tam giác ABC có A >90° đường tròn đường kính BC cắt các góc cạnh AB ở E,AC ở D a)CHỨNG MINH tam giác AEC đồng dạng tam giác ADB b) gọi H là giao điểm của BD với CE chứng minh AH vuông góc BC
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S+ started/ began +V-ing/ to V + in / at …….. + ………. ago S+ have/ has + P2 + since (in/at…) + for (…… ago) 1. I have started learning English in 2000. I ………………………………………… 2. My sister began to teach English 20 years ago. My ……………………………………………. 2. It began raining half an hour ago. It ……………………………………… 3. They have built this hotel for a year. They …………………………………………. 4. He has had his breakfast since 7 o’clock. He ………………………………………… 5. Mr. Ba has talked to our teacher for an hour. Mr. Ba …………………………………. 1. We started working here 2 years ago. We ………………………………………………… TOO- ENOUGH S + V (not) + adj/ adv + enough + to V <->S + V + too + adj/ adv ( trái nghĩa) + to V 1. My brother isn’t old enough to ride a motorbike. My brother is ………………………………………………. 2. I wasn’t tall enough to reach the book. I ………………………………………………………………. 3. He didn’t speak clearly enough for me to understand. He …………………………………………………………….. 4. Her son doesn’t study hard enough to pass the exam. Her ………………………………………………………….. 5. William is too fat to wear the jeans. ……………………………………………………………….. 6. David was too sick to go to work. …………………………………………………….. 7. The tables were too heavy for me to lift. ………………………………………………………….. 8. She is too weak to get up. ………………………………………………………

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