Put the verbs in brackets into the correct form.

UNIT I

SEMICONDUCTORS OF N-TYPE AND P-TYPE

Language Work

(I) If/when-clause (If/when I install …, it will result in … )

If/ when	+	Present Simple	+	Future Simple
I/we/you/they	add/form/leave	I/we/you/they he/she/it	will	except/attempt/ require
he/she/it	adds/forms/leaves

or

Future Simple	+	if/ when	+	Present Simple
I/we/you/they he/she/it	will	except/attempt/ require	I/we/you/they	add/form/leave
he/she/it	adds/forms/leaves

For example:

If/when we add a small amount of arsenic to silicon, several valence electrons of each arsenic atom will form covalent bonds with the neighbouring atoms of silicon.

If/when gallium is introduced into a silicon crystal, each gallium atom will attempt to form a covalent bond with each of its four neighbouring silicon atoms.

Fill in the table.

Noun	Verb	Adjective	Adverb	Translation	Transcription
acceptor	accept	acceptor (impurity)	-	принимать, признавать, акцептор, акцепторная примесь	[qk′sept]
attempt				попытка	[q′tempt]
	calculate				[′kxlkjuleIt]
conclusion				заключение
	condense
		continuous		непрерывный	[kqn′tinjuqs]
	install			устанавливать	[in′stO:l]
			loosely	свободно
majority/ majority charge carriers				большинство/ основные носители заряда	[mq′GOrItI]
minority/minority charge carriers				меньшинство/ неосновные носители заряда	[maI′norItI]
	progress
	require			требовать

Put the verbs in brackets into the correct form.

1. What (occur) if holes and electrons (meet) in a semiconductor?

2. We (get) an N-type semiconductor, if we (add) arsenic to silicon.

3. If gallium (introduce) into a silicon crystal, it (result) into a P-type semiconductor.

4. If the electron (have no) pair, it easily (free) itself.

5. A semiconductor (call) an N-type semiconductor, if the holes (be) the minority charge carriers.

6. If the thermal agitation (apply) to the silicon crystal, we (have) the holes, moving in the same way as the holes introduced by atoms of gallium.

3. Write a sentence with if/when … for each situation.

1. We can’t pretend to the best mark on our subject without the knowledge on P-type and N-type semiconductors.

If we have knowledge on P-type and N-type semiconductors we will pretend to the best mark on our subject.

2. I don’t make an impurity semiconductor, because I have no necessary equipment. If/when …, I… .

3. I am not a member of the scientific group of the Semiconductor Development Department, so my name is not mentioned in the diploma. My name …, if/when I … .

4. I have always wanted to be a famous actor, and I’m not interested in conferences in physics.

If I …, my attention … .

5. My father works at the plant developing new types of semiconductor devices, and he is going to represent some of his equipment at a technical exhibition.

If my father … , he …