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1、Book5 Unit41. be to + v. 表将来We are to meet at the school gate.2. never, seldom, scarcely, barely, little, not only, not until, hardly, no sooner位于句首时，句子部分倒装。Never have I seen such a performance.3. be delighted at be delighted to do be delighted that4. assist sb. with sth. assist sb. in doing sth. as
2、sist sb. to do sth. assistance n. assistant n.5. concentrate on 6. not onlybut also a. 连接并列主语时，谓语动词使用就近原则Not only students but also teacher loves the painting. b. 连接并列句时，not only位于句首，前句部分倒装。Not only does he speak English correctly, but also he speaks it fluently.7. accuse sb. of sth.8. inform sb. of
3、 sth. inform sb. that keep sb. informed (of sth.) informed adj. information n.9. keep in mind10. depend on11. deliberately / on purpose / by design12. so as to / in order to13. demand sth. of sb. demand to do demand that (should) v. satisfy /meet ones demands14. ahead of15. approve (doing) sth. approve of sth. approve of sbs doing sth. approval n.