16. begin to do sth
begin/start to do/doing sth
17. can/be able to afford (to buy) sth 有能力购买（供）……
18. can/may/must do sth could/would/should/might do sth
19. can’t wait to do sth 迫不急待地去做某事
20. decide to do sth 决定去做某事
make up one’s mind to do sth 下决心去做某事（常考）
make a decision to do sth 对做某事作出决定
21. deserve to do sth 值得/应该做……
22. encourage sb to do sth 鼓励某人去做某事
23. enjoy doing sth 乐意去做某事
24. expect (sb) to do sth 期望去做某事
25. fail to do sth 做某事失败
succeed doing sth 成功做了某事