2．concerned adj.关心的；担心的，忧虑的(作前置定语)；有关的；参与的(作后置定语)

(1)be concerned about/for sth./sb.关心/担忧某事或某人

be concerned with涉及......，与......相关

be concerned that担心......

as far as I'm concerned在我看来

(2)concern n．[C]&[U]担心，关注(与about/for搭配)；关系，利害关系(与with搭配)；v.关心；挂念；涉及；关系到

(3)concerning prep.关于

(1)We are concerned about/for his safety.

我们担心他的安全。

(2)Air pollution is concerned with carbon dioxide.

空气污染与二氧化碳有关。

(3)As far as I am concerned，the new plan isn't very practical.

在我看来，这个新计划很不实用。

[高级表达]

(4)As she was concerned about her husband，she couldn't sleep well.(用形容词短语作状语改写)

Concerned about her husband，she couldn't sleep well.

[单句改错]

(5)He asked several questions the future of the company.

3．major adj.主要的；多数的；(较)重要的；vt.主修，专攻；n.主修课程；专业学生

(1)major in sth.主修/专攻......

(2)majority n．大多数，大部分

注意：①"the majority of＋复数名词"作主语时，谓语动词用复数。

②当majority后面不接of短语时，若强调整体，谓语动词用单数；若强调个体，谓语动词用复数。

(1)There were calls for major changes to the welfare system.

有人要求对福利制度进行重大改革。

(2)He majors in maths in college.