46. learn to do sth 学做某事
learn sth from sb 向某人学习
47. like to do/doing sth 喜欢做某事
like sb to do sth 喜欢某人做某事
48. need to do sth
need doing sth/to be done
need sth needn’t do sth
49. prefer to do sth rather than do sth 宁愿……而不愿……（常考）
prefer doing sth to doing sth 喜欢做……胜过做……
e.g: I prefer reading books to going shopping. 比起购物来，我更爱读书。
prefer to do sth 喜欢（爱）做某事
50. refuse to do sth 拒绝做……
51. remember/forget to do sth 记得/忘记做某事
remember/forget doing sth 记得/忘记做过某事
52. see sb do sth 看见某人做某事（结果）
see sb doing sth 看见某人正在做某事（正在进行中）
be seen to do sth 做某事被看见
53. something to eat/drink 一些吃/喝的东西（词不定式放在something等后修饰这些词）
e.g: I need something to eat. 我要一些吃的东西。
54. spend some time (in)doing sth /on sth 花费时间做某事（注意动词要用ing形式）（常考）
spend some money on sth/doing sth 买……花了多少钱
55. Sth is hard/difficult/easy to do . 做好某事很难/容易