1、admit, confess, concede这几个动词都有"承认"的意思。 admit [ədˈmit] v.指由于说服、再三追问而"承认"某一事实或过错。 I admit that you have a point.我承认你有理。 confess [kənˈfes] v.供认(罪行、过错等)，含有"坦白、招认"的意思。 He confessed his crimes to the judge.他向法官供认了他的罪行。 concede [kənˈsi:d] v.指曾想隐瞒或不愿意承认某一错误，但由于证据确凿而不得不勉强承认，还可以指"以退为进"的承认。 The man who caused the accident finally conceded to the police that he had done it.造成这次交通事故的人最终向警察承认他是肇事人。
2、affirm, assert, allege, claim, announce, proclaim这一组动词都有"声称"的意思。 affirm [əˈfə:m] v.坚信不疑地肯定或宣称，是deny的反义词。 He affirmed his love for her.他发誓爱她。 assert [əˈsə:t] v.指不管事实如何，主观自信地宣称，或者清楚有力地坚持某个情况为事实。 She asserted that she was innocent .她宣称自己是无辜的。 allege [əˈledʒ] v.在无真凭实据的情况下宣称、断定。 The suspect alleged that he had not been in the neighborhood at the time of the crime.嫌疑犯声称案发时他不在现场。 claim [kleim] v.要求，声称，断言。多指根据某种规定提出的要求或主张。 They claim that if more people rode bicycles to go to work there would be fewer automobiles in the downtown section of the city.他们生成如果有更多的人骑自行车上班的话，闹市区的汽车就会有所减少。 announce [əˈnauns] v.宣布，宣告。多指首次当众正式宣布某一主张或态度，常常带有预告的意味。 The invention of the printing press announced the diffusion of knowledge.印刷术的发明宣告了知识普及时代的来临。 proclaim [prəˈkleim] v.宣布；宣告(成立)。指经过深思熟虑后向大众宣布一个明确的决定或判断，尤其指重大事件的宣布，多用于官方场合。 The president proclaimed an emergency when the war came.当战争来临的时候总统宣布进入紧急状态。
3、aggravate, reinforce, increase, strengthen, intensify 这一组动词都有"加强"的意思。 aggravate [ˈæɡrəveit] v.加重(负担、罪行、病情等)，使之恶化。 I hurt my foot, then aggravated it by trying to walk too soon.我的脚受伤了，而过早的下地走路又加重了伤情。 reinforce [ˌri:ɪnˈfɔ:s] v.增援，一般用于军队或警察的行动；(添材料等)加固。 A police officer saw three thieves robbing a bank and radioed to reinforce him.一位警察看到三个盗贼抢劫银行，用无线电话要求增援。 increase [inˈkri:s] v.指数量上的增加。 The number of people has been increased.人数增加了。 strengthen [ˈstreŋθn] v.加强，巩固，增强，相当于to become stronger。 Exercising every day strengthens the heart.每天锻炼可以提高心脏的功能。 Competition, they believe, strengthens the national character rather than corrupt it.人们认为竞争加强了民族性而不是破坏了它。 intensify [inˈtensifai] v.使变得更强烈、剧烈，加剧，相当于to become more intense or intensive。 intensify colors加深色彩intensify hatred加深仇恨
