Unit 10

The P-N Junction

Language work

If	+	Past Simple		+	Future in the Past
		I/we/you/they he/she/it	introduced/installed/lost		I/we/you/they he/she/it	would	part/conclude/note

(II) If-clause (If I determined …, it would occur … )

or

Future in the Past			+	if	+	Past Simple
I/we/you/they he/she/it	would	part/conclude/note				I/we/you/they he/she/it	introduced/installed/last

For example:

• If I doped donor atoms at one end and acceptor atoms at the other end of a silicon crystal, it would have both P-type and N-type regions and there would be a junction between them.

• If free electrons and holes moved in a controlled manner, they wouldn’t wander freely in the lattice.

I wish I determined…

wish + Past

For example:

• I wish I measured these parameters more carefully.

(=I don’t measure them carefully)

• I wish I could gain the higher results. (I can’t)

Remember:

If I were/if I was

I wish it were/I wish it was

For example:

• If I were you, I would correct this test.

or If I was you, …

• I wish it were possible.

(III) If-clause (If I had designed …, they would have set up … )

If	+	Past Perfect		+	Future Perfect in the Past
		I/we/you/they he/she/it	had introduced/ had installed/ had lost		I/we/you/they he/she/it	would	have parted/ have concluded/have noted

or

Future Perfect in the Past			+	if	+	Past Perfect
I/we/you/they he/she/it	would	have parted/ have concluded/have noted				I/we/you/they he/she/it	had introduced/ had installed/ had lost

For example:

• If I had determined a fault, I would have corrected it. (but I didn’t determine it)

• If one region had lost a positive charge, the other region would have gained it.

(but it didn’t lose a positive charge)

I wish I had designed…

wish + Past Perfect

For example:

• I wish I had constructed my replica. I would have used it now. (but I didn’t construct it)

• I wish I had corrected some measurements in my laboratory work. I would have obtained a higher result. (but I didn’t correct them)

Wish

1. Wish somebody something, but hope somebody do something.

For example:

• I wish you an easy test.

• I hope you get perfect results in your mathematical test.

2. Wish + Past (we regret something. The meaning is present.)

For example:

• I wish you didn’t reach critical values. (you reach them)

• Mike’ s going to overcome all difficulties. I wish I was going too.

Wish + Past Perfect (we regret something in the past)

For example:

• I wish I had simulated this object with the help of the new computer. (I didn’t simulate)

• I wish I hadn’t replaced parts in the machine. (I replaced)

3. I wish I could (do something) =

I regret that I cannot do it.

For example:

• I’m sorry I can’t help you. I wish I could calculate the resistance in this task. (but I can’t)

I wish I could have (done something) =

I regret that I could not do it.

For example:

• I hear you bought a new computer. I wish I could have gone to look at it. (but I couldn’t go)

4. I wish (somebody) would (do something)

(we would like something to happen)

For example:

• I wish my computer would outstrip all friends’ ones.

• I wish somebody would help me to measure the current in the laboratory work.