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This module focuses on six tenses within two verb tense areas: The simple and the perfect tenses . The simple tenses consist of the present , the past , and the future . The perfect tenses are the present perfect , the past perfect , and the future perfect .

Verbs are conjugated to show the time an action or idea is expressed. The time conveyed by a verb is its tense . A verb tense shows the particular time in which an action took place and its relationship to when the action was spoken or written.

Each of the six tenses covered in this module has its own usage and form of conjugation.

The six tenses:

The simple tense

Simple tenses indicate simple time relationships.

The present tense expresses an action in the present or one that occurs always, repeatedly, or habitually.

Example: The horses eat the hay every day.

The past tense conveys a definite completed action in the past.

Example: The horses ate the hay last week.

The future tense communicates an action that has not yet occurred but will take place in the future. This tense uses “ will ” or “ going to ” with the past participle.

Example: The horses will eat / are going to eat the hay tomorrow.

The past participle

The past participle of a verb usually indicates a completed action and generally has the same form as the past tense. Regular forms of the past participle usually end in – d , - ed , - n , - en , or - t.

The following hand out lists the present, past, and past participle for common irregular verbs: Irregular Verb tense list

The perfect tense

A verb in the perfect tense expresses an action that was or will be completed at the time of another action or a specific occasion. The perfect tense of an action uses have or has with the past participle.

The present perfect tense expresses an action that is completed at the present time or is continuing into the present. This tense uses have or has + the past participle of a verb.

Example: The horses have eaten all the hay this morning.

The horse has eaten all the hay this morning.

The past perfect tense conveys an action that was completed before a time in the past. This tense uses had + the past participle of a verb.

Example: The horses had eaten all the hay before it rained.

The horse had eaten all the hay before it rained.

The future perfect tense expresses an action that has not yet occurred but will take place in the future. This tense uses will or going to + have + the past participle of a verb.

Example: The horses will have eaten / are going to have eaten the hay before it rains.

The horse will have eaten / is going to have eaten the hay before it rains.


Students will learn that verb conjugation depends on the time in which an action or idea is expressed.

The students will learn that the two basic forms of verb tenses for the present, past, or future times are the simple tense and the perfect tense. They will also learn that in the present tense, a singular subject takes a singular verb and that singular verbs end with – s . Furthermore, a plural subject takes a plural verb, which does not end with – s .

Students should also learn that the perfect tense always ends with the past participle of a verb.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Civis project - uprm. OpenStax CNX. Nov 20, 2013 Download for free at http://cnx.org/content/col11359/1.4
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