                                 she is
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                                                              had
Sequence of tense rule not followed:Â The newspaper reported that world leaders have failed to agree at the conference.
                                                               be
Subjunctive verb not used:Â Environmentalists urged that carbon dioxide emissions are decreased immediately.
                                                             X            X
Incorrect punctuation:Â Everyone wonders when world peace will become a reality? Everyone hopes, that peace will come soon.
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A College Lecture
1Professor Sanchez gave a lecture on transistors last Tuesday. 2First, he explained what are transistors. 3He said, that they are very small electronic devices used in telephones, automobiles, radios, and so on. 4He further explained that transistors control the flow of electric current in electronic equipment. 5He wanted to know which popular technological invention cannot operate without transistors. 6Most students agreed, it is the personal computer. 7Professor Sanchez then asked if the students know how do transistors function in computers. 8He said that the transistors were etched into tiny silicon microchips and that these transistors increase computers' speed and data storage capacity. 9Then he asked the class when had transistors been invented? 10Sergei guessed that they were invented in 1947. 11The professor said that he is correct. 12Professor Sanchez then asked what was the importance of this invention? 13Many students answered that it is the beginning of the information age. 14At the end of the lecture, the professor assigned a paper on transistors. 15He requested that each student chooses a topic by next Monday. 16He suggested that the papers are typed.
