3)复杂句：

　　宾语从句：

　　表述观点：

　　认为： insist, maintain, hold, suggest, argue,

　　支持：favor, propose, support, agree, advocate,

　　(be for, be in favor of)

　　反对：object, oppose

　　(be against)

　　Some people do believe that

　　Some people are fully convinced that

　　Some people assert that

　　Some people deem that

　　Some people argue that

　　Some people claim that

　　Some people doubt that

　　Some people deny that

　　What 引导的

　　What I learn

　　What I see

　　What I need

　　主语从句：

　　1. It is suggested in the graph that…(indicate, demonstrate, illustrate)

　　It is reported that/estimated that/proved

　　It is well-known/generally accepted/universally acknowledged

　　2. Whether S +V is a controversial issue.

　　Whether we should make effort to/endeavour to preserve endangered species is …

　　Whether we should do…depends on whether S +V

　　Whether we will succeed depends on whether we persist.

　　3. What we should do is to do….

　　We should protect animals.

　　What we should pay attention to/ emphasize/stress is to do

　　What teachers should emphasize is to tell students to practice more.

　　What we are faced with is that …

　　What we are confronted by is…

　　the depletion of natural resources

　　What we should solve immediately is that…

　　What concerns us most is…

　　What we am concerned with

　　主语从句：it is …

　　It is important/vital/crucial/pivotal/essential/significant(… 很重要)

　　It is clear/evident/obvious/manifest/as clear as crystal/quite common(。。。 很明显)

　　It is undoubted/undeniable/doubtless (。。。 毋庸置疑)

　　It is a pity/a shame/a common sense/practice( 这是个常识)

　　It is well/increasingly/widely/commonly/generally known/recognized/accepted/acknowledged (众所周知)

　　It is conceivable that 可想而知

　　It is desirable/admirable that 可取的

　　It is advisable that 最好做某事

　　It is probable/possible/likely that 可能的

　　It is imperative that 必要的

　　it is preferable/profitable that

　　It is hazardous/risky/perilous that 危险的

　　It must be stressed out that 必须要指出

　　It must be admitted that 必须要承认

　　It is reported that 据报道

　　It is suggested that 有人建议

　　It is assumed that 有人认为

　　It is estimated that 据估计

　　It is always the case that 情况总是这样的

　　It is not always the case that 情况不一定总是这样的

　　It follows that由此可见，