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.

хорошист549    3   20.10.2020 20:50    1