高考英语常用短语必背包括以下几类：
动词短语
look after 照顾；照料
look ahead 向前看；展望未来
look at 看；注视
look back 回顾；回头看
look down on/upon 轻视；看不起
look for 寻找
look forward to 盼望；期待
look into 调查；观察
look out 当心；留神
look over 检查；
数量短语
a（large）number of 许多
a bit 一点儿
a block of 一块
a bottle of 一瓶
a few 许多
a good/great deal of 大量（的）；非常多（的）
a great/good many 很多的，非常多的
a group of 一群，一组
a little 少许
a lot of/lotsof 许多
a pair of 一双，一对
a piece of 一片（张，块）
a pile of 一堆
其他常用短语
after a meal 饭后
an enjoyable and exciting experience 一段令人愉快和兴奋的经历
have much experience in doing sth 在某方面有丰富的经验
attend an assembly 参加集体晨会
sound like +n/从句 听起来像
it is a... 是...
日常用语
Good morning/afternoon/evening. 早上好/下午好/晚上好｡
How are you？ 你好吗？
Hello/Hi! 你好!
Goodbye/Bye! 再见!
Please sit down. 请坐｡
Have a cup of tea/coffee. 喝一杯茶/咖啡。
接不定式（而不接动名词）作宾语的动词
afford to do sth. 负担得起做某事
agree to do sth. 同意做某事
arrange to do sth. 安排做某事
ask to do sth. 要求做某事
beg to do sth. 请求做某事
care to do sth. 想要做某事
choose to do sth. 决定做某事
decide to do sth. 决定做某事
表达个人观点的短语
as far as I'm concerned 就我而言
As long as you have a dream 只要你有梦想
这些短语在高考英语中经常出现，掌握它们有助于提高英语水平和应试能力。建议同学们在平时的学习中多加积累和复习，确保在考试中能够熟练运用。