不定式和现在分词独立成分作状语 1. to be frank 坦率的说 2. to tell you the truth 老实说 3. to be honest 老实说 4. to make matters worse更糟糕的是 5. to begin with 首先 6. to make/cut a long story short长话短说 7. to be brief 简单地说 8. to be exact精确的说 9. to be sure 的确, 确实 , 诚然, 无可否认 10. to sum up 总而言之 11. to put it mildly说的轻些, 说的婉转些, 不夸张的说 12. to conclude 最后, 总之 13. not to mention 更不必说