Exercise 5. Put the verbs in brackets into the correct infinitive form or gerund form.

Exercise 1. Turn the following sentences into reported speech.

1. “I can’t see you this afternoon because I’ve got a lot to do”, Ann told me. 2. “Those were good times for my family”, Jack said. 3. “You must check everything”, the director said. 4. Keith said, “There is a letter for you on the table.” 5. “I haven’t spoken to Mary since last week”, Gloria said. 6. Jane said, “I haven’t finished my homework yet.” 7. “We don’t want to watch a film tonight,” the children said. 8. “They are working over a new project now”, Mr. Stone explained. 9. “We’ll start our work on time”, they promised. 10. “You should make a decision”, he told us.

Exercise 2. Rephrase the following sentences in as many ways as possible.

1.I advice you to buy this book.

You should / ought to buy this book.

2.It isn’t necessary for him to take the exam again.

3.You are not allowed to eat and drink in the classroom.

4.We are obliged to clock in and out every day.

5.It wasn’t necessary for John to attend the seminar.

6.They were obliged to go to the meeting last week.

7.You had better book your flight early.

8.It is forbidden to copy files without the manager’s permission.

9.I’m sure Peter misunderstood my instructions.

10.I’m sorry, but you are not allowed to enter the room.

Exercise3. Complete the sentences writing in the correct modal verbs.

1.For accurate results, the simple Eq. (4.2) _______ ____ be applied to metallic circuits having finite cross section. In some cases, the finite conductor ______________ be considered as being divided into a large number of filaments connected in parallel, each having its own induced voltage and its own resistance. In other cases, such as the common ones of D.C. generators and motors and homopolar generators, where there are sliding and moving contacts between conductors of finite cross section, the induced voltage between neighboring points ___________ ________ be calculated for various parts of the conductors. These ______________________ then be summed up or integrated. For methods of computing the induced voltage between two points, see text on electromagnetic theory. (cannot; is to; can; can)

2.The field map consists of lines of force and equipo-tential lines which _______ _______ intersect at right angles. In sketching the field map, first draw those lines which _____________be drawn by symmetry. (can; must)

3.The natural frequency (resonance) of mechan­ical vibration of the conductors _______________ add still further to the maximum force, so a factor of safety _____should_________ be used in connection with Eq. (4.16) for calculating stresses on bus bars. (may; should)

Exercise 4. Complete the sentences with the correct infinitive tense.

1.He has grown taller. – He seems to have grown taller.

2.He is getting used to his new job. – He appears_______________________

3.Kate makes friends easily. – Kate tends____________________

4.He has finished the report. – He claims ___________________________

5.They have sailed round the world. – They are reported__________________

Exercise 5. Put the verbs in brackets into the correct infinitive form or gerund form.

1. A capacitor is a circuit element that is described through its principal function, which is to store (store) electric energy.

2. At times it is useful ______________ (evaluate) materials and media by _________________ (compare) their energy storage capability on a unit volume basis. 3. In contemporary vector cal­culus notation, four equations can be written ________________ (describe) the basic theory of electromagnetic fields. 4. This means that it is possible ______________ (neglect) the spatial variations in electromag­netic quantities. 5. Another way of _______________ (say) this is that the dimensions of the circuit are small compared with the wavelengths of the electromagnetic quantities and thus that it is necessary ___________________ (consider) only time vari­ations. 6. The second fundamental principle, abbreviated KVL, follows from _______________ (apply) the assumption of small size to Faraday's law in integral form. 7. In circuit analysis, the goal is ____________(start) with a connected set of circuit elements such as resis­tors, capacitors, operational amplifiers, and other devices, and ____________ (find) the voltages across and currents through each element, additional quantities, such as power dissipated, are often computed. 8. ________________ (energize) the circuit, sources of electric energy must be connected.

Date: 2015-12-24; view: 2474