文档介绍：1. differ differ from sb. /sth. differ with /from sb. about /on sth. 关于某事与某人有异议 differ in sth. difference n.; different adj. ;differently adv. the difference between A and B make a difference make no difference be diffenent from … in… Practice: The twin brothers are alike in appearance but different in character. It makes no difference to me whether es or not. The distinct difference in their characters contributed to their breaking-up. 2. exact 精确的, 准确的; (人)严谨的,严格的,一丝不苟的;精密的,严密的 an exact copy of the picture his exact words 他的原话 at the exact moment=at the same time to be exact : used to express that what you are saying is exact 确切地说 to be honest : used when you tell someone what you really think 说是在的 to be sure: used to admit sth. is true before saying the opposite 诚然,固然,无可否认 to be fair: used when adding sth. after criticizing someone 公平地说,说句公道话 Practice: 1. ---Do you know that man stole my purse and lied about it? ---Well, to be honest ,I’ ve never liked him very much. 2. She is over thirty, to be exact she is thirty 33. 3. ---It must have been a tiring experience to travel to your mother ’s village last week. I hear that there is no railway station there. ---It was difficult, to be sure, but we got there by bus in the end. 4. ---Is ing? ---No. She should have let us know earlier, but to be fair she has been very busy recently. 3. undertake vt. 着手,从事,承担,负责;保证,承诺,答应 undertook ,