NB: In the Conditional sentences of Type II, the verb to be used in the subordinate clause can acquire the form of were for he, she, it and I.
13. Put the verbs in brackets in appropriate form so that Conditional
sentences of Type II are correct. Make your choice between positive and
negative forms.
1. The wire (rotate) around the magnet if it (be supplied) with
current from a chemical battery.
2. If you (move) a magnet through a loop of wire, an electric current
(flow) in that wire.
3. The current also (flow) if the loop (be moved) over a
stationary magnet.
4. If you (rub) the amber for long enough, you (get) an
electric spark to jump.
5. If you (study) the subject closer, you (see) many ways of
carrying an electric current.
6. A proton and a neutron (move) very slowly if they (be) in a
helium nucleus.
7. Vacuum furnaces make use of induction heating for the production of
special steels and other alloys that (oxidize) if one (heat)
them in the presence of air.

14. Put the verbs in brackets in appropriate form so that Conditional sentences
of Type III are correct. Make your choice between positive and negative forms.
1. If they (have) difficulties with the engine, the passengers
(sit) in the plane when the bomb went off.
2. Audible noise (be produced) by cookware exposed to high
magnetic fields if the cookware (have) loose parts.
3. If a positive charge (be brought) near the metal object, the
negative charges in the metal (be attracted) toward it.
4. If the external charge (be) negative, the polarity of the charged
regions (be reversed).
5. If an electrical contact (be made) between the electroscope
terminal and ground, it (cause) charge to flow from ground to the
terminal.
6. If a positive charge (be brought) near a nonconductive object, the
electrons in each molecule (be attracted) toward it.
7. If a liquid or gas (contain) ions, then the ions (be made) to
flow as an electric current.

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Ответ:

lisss2005

19.06.2022 18:11

Task 1. Choose the correct tenses.

1). I’m sorry for her, she (have) bad luck all her life. 2). I (want) to be a doctor until I was fifteen. 3). He (be) unemployed ever since he left school. 4). How long (you live) in this town? 5). I (not work) very hard when I was at university. 6). He was ill before Christmas, but he (be) fine since then.7). I (have) trouble sleeping all this week. 8). I (learn) a lot in this job. 9). I (have) trouble sleeping all last week. 10). I (not learn) much in that job. 11). My boyfriend and I (know) each other for ages. 12). He (live) in Durban for a year before he got married.

Task 2. Complete the sentences with Present Perfect or Past Simple.

1). I (play) a lot of tennis this year. 2). She (have) six different jobs since she left school. 3). He (run) away from school three times when he was fourteen. 4). How many cups of coffee (you drink) today? 5). In those days, Andrew (come) to stay with us most weekends. 6). Shakespeare (write) poems as well as plays. 7). Since my brother lost his job, he (write) two books. 8). Would you believe I (make) twenty-three phone calls today? 9). Our team (just lose) eight games one after the other.

Task 3. Write the verbs in Present Perfect.

1). I’m afraid I (forget) my book at home. 2). … the secretary (yet come)? 3). I (learn) the rhyme. Could you listen to me? 4). They (already inform) me about the accident. 5). He is the most handsome man I (ever know). 6). Galina (already leave for) Manchester. 7). He (not receive) any letters from her this week. 8). I (not hear) from him since he left Paris. 9). I (not see) Golitsyn for ages. 10). … you (have) a holiday this year? 11). We (see) some good films recently. 12). They (wait) for you for half an hour. 13). Ludmila (have) a headache since she came from the theatre. 14). Ilya (work) in the bank for a year. 15). Yelena (be) ill for a fortnight. 16). … you (ever ride) a horse? 17). … you (ever be) to Italy?

Task 4. Present Perfect or Past Simple?

1). We (not have) a holiday last year (A. didn’t have. B. haven’t had. C. hadn’t have). 2). The Tretyakovs (be) to the USA many times (A. have been. B. were. C. have being). 3). I (buy) a new dress last week, but I (not wear) it yet (A. have bought. B. bought. C. had bought. D. haven’t worn. E. wore. F. didn’t wear). 4). … it (stop) raining yet? (A. Did it stop. B. Is it stopped. C. Has it stopped). 5). Don’t worry about your letter. I (sent) it the day before yesterday (A. sented. B. have sent. C. sent). 6). I (lose) my glasses. I (have) them when I came to the college this morning (A. losed. B. have lost. C. lost. D. have had. E. had. F. have). 7). When Mikhail (finish) school? (A. When had Mikhail finished school? B. When has Mikhail finished school? C. When did Mikhail finish school?). 8). When I was a child, I (always be) late for school (A. have always been. B. was always late. C. had always been). 9). I can’t find my umbrella. I think somebody (take) by mistake (A. took. B. taken. C. has taken). 10). “Are you tired?” “Yes, a little. I (paint) the ceiling today (A. have painted. B. painted. C. paint). 11). We (not see) Victor this week, but we (see) him a couple of weeks ago (A. didn’t see. B. haven’t saw. C. haven’t seen. D. saw. E. have saw. F. have seen). 12). “Have you got any money?” “Yes, I (borrow) it from my brother (A. borrowed. B. have borrowed. C. did borrow). 13). “Where is Tatyana?” “She (go) the shops. She’ll be back soon (A. went. B. has gone to. C. has been to). 14). Vasilyev (work) in the bank for three years since 1990 to 1993 (A. has worked. B. had worked. C. worked). 15). Viktor (lose) his car keys, so we have to open the door by force (A. has lost. B. lost. C. losed). 16). One of the passengers (die) in that accident (A. has died. B. died). 17). Vladimir and Maria (be married) since last Christmas (A. were married. B. have married. C. have been married). 18). … the post (come) today? (A. Did the post come today? B. Has the post come

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