1、more than 多于；不仅
not more than 不多于
no more than 仅仅
less than 少于
not less than 不少于
①Did you know there is more than one kind of English in the world?
你知道世界上的英语不只一种吗？
②I’m afraid she is less than eighteen this year.
恐怕她今年不到18岁。
③There are not more than fifty-four students in each class.
每个班上的学生不多于54人。
④Her sister is no more than eleven old this year.
她妹妹今年（仅仅）只有11岁。
2、play a … role/part in 扮演……角色；担任……职务
play a … part in take a … part in
①Women of China play an important role/part in every field.
中国妇女在各个领域都发挥了重要作用。
②This actor played a leading part/role in this film.
这个演员在那部电影中担任主角。
③We all take/play an active part in sports.
我们都积极参加体育锻炼。
3、then ever before 比以往任何时候更……
than before, than ever 比以前
than usual 比平时……
这些短语常与比较级连用，例如：
①Tom got up earlier this morning than ever before.
汤姆今天比以往任何时候都起来得早。
②Most of us study English much harder than before/ever/usual.
我们大多数人学英语比以前用功多了。
4、because of 介词，“因为”的意思，其后接名词、代词或短语等，不能接句子。because
连词，也是“因为”的意思，其后要接句子。
①The boy didn’t come to school yesterday because he was ill.
②The boy didn’t come to school yesterday because of his illness.
5、a number of“大量的，很多的”意思，修饰可数名词，其后谓语要用复数；the number
of …的数量（数目），谓语要用单数。
①A number of foreigners are going to our school.
很多外国人要到我们学校来。
②The number of the students of our school is 2500.
我们学校的学生总数是2500人。
6、come up 上来，过来；生长出；出现，发生
①Will you come up to Beijing next month?
你下个月能到北京来吗？
②They got up early to watch the sun come up.
他们早起，为的是看日出。
③Spring has come and the grass is beginning to come up.
春天到了，草开始长出地面。
7、such as, like, for example这三个词语都有“例如”的意思，for example在句首时，
后面用逗号隔开，在句中时前后都用逗号隔开；such as和like用于句中，之后不能用
逗号隔开。
①English is also spoken in many other countries, such as South Africa, Singapore
and Malaysia.
其它一些国家也讲英语，比如南非、新加坡和马来西亚。（此处的such as可换为like）
②He likes sports very much, for example, swimming and skating.
他非常喜欢体育运动，比如游泳和滑冰。
8、give a command（名词） = give orders 下命令；
command sb to do sth（动词） = order sb to do sth 命令某人做某事
①The soldiers started out as soon as the officer gave a command.
军官一下命令战士们就出发了。
②The officer commanded/ordered the soldiers to set out at once.
军官命令战士们马上出发。