Unit1. Diodes Language Work

Present Simple

Positive

I/we/you/they	amplify/define / direct
he/she/it	amplifies/defines / directs

For example:

• Diodes permit current to flow in only one direction.

• The dictionary defines electronics as the study of conduction of electricity.

Spelling

-es after -s / -sh / -ch: pass passes, finish finishes, watchwatches

-y  -ies: study studies, rectifyrectifies

also: do does, gogoes

Reading

		directs
–s(es)		defines, amplifies
		passes

Remember:

I/we/you/they have

he/she/it has

For example:

• Diodes have 2 basic elements.

• Every diode has a cathode and a plate.

Negative (with the auxiliary verb)

I/we/you/they	don't	amplify/define / direct
he/she/it	doesn't

For example:

• Diodes don’t permit current to flow in opposite directions.

• Positive voltage on the plate doesn’t repel electrons.

Negative (with NO auxiliary verb)

I/we/you/they/he/she/it	can/ may/must	not	amplify/define / direct
I/we/you/they/he/she/it	am/is/are	not	a physicist(s)
I/we/you/they/he/she/it	have/has	no/hasn’t or don’t/doesn’t have	-/a heater

For example:

• These devices can’t be amplifiers.

• They are not physicists.

• This gadget doesn’t have a/has no heater.

Remember: There is no grid in a diode. But: There isn’t a grid in a diode.

A diode has no grid. A diode hasn’t a grid.

Questions (with the auxiliary verb)

Do	I/we/you/they	amplify/define / direct?
Does	he/she/it

For example:

• Do diodes permit current to flow in only one direction?

• Does the dictionary define electronics as the study of conduction of electricity?

Questions (with NO auxiliary verb)

Can/ may/must Am/is/are Have/has

I/we/you/they/ he/she/it I/we/you/they /he/she/it I/we/you/they/ he/she/it

amplify/define/direct? (a) physicist(s)/direct current? a heater?

For example:

• Can these devices be amplifiers?

• Are they physicists?

• Has this gadget a heater?/Does this gadget have a heater?

Remember: 1. I am a physicist, aren’t I?

2. In the following examples, do is also the main verb (do you do / doesn't do etc.):

□ 'What do you do?' I work in a shop.'

□ He's always so lazy. He doesn't do anything to help.

The verb to be

I	am	(I'm)		I	am	not	(I'm not)
he		(he's)		he			(he's not	or	he isn't)
she	is	(she's)		she	is	not	(she's not	or	she isn't)
it		(it's)		it			(it's not	or	it isn't)
we		(we're)		we			(we're not	or	we aren't)
you	are	(you're)		you	are	not	(you're not	or	you aren't)
they		(they're)		they			(they're not	or	they aren't)

For example:

• I am/am not a physicist.

• He is/is not a famous scientist.

• Rectifier isn’t an electrical device.

• It isn’t easy to explain the operation of semiconductor devices.