English Grammar

Invariable words definition and examples

Invariable words

The invariable words are those that do not change in terms of gender and number. That is, they are those that do not require or admit in their formation some morpheme that adds an inflection so that it is not necessary that they agree in gender and number with the rest of the words of the sentence. The invariable words are the following: Invariable words definition and examples

  • Prepositions
  • Adverbs
  • Interjections
  • Conjunctions

We are going to see each of them in-depth as well as examples of them that will help us to identify and distinguish them.

1-The prepositions

The prepositions are those words used as connections invariable within the same sentence. These unions made by prepositions always act as a prepositional phrase and remain unchanged. You can check them all in the list of prepositions and some examples of these in sentences:

  • TO
  • In view of
  • Under
  • It fits
  • With
  • Against
  • From
  • Since
  • On
  • Between
  • Toward
  • Until
  • Through
  • In order to
  • For
  • According
  • Without
  • SW
  • On
  • After

Some examples of sentences with prepositions are:

  • The ball of Angel is a gift from her mother.
  • The boy had hidden behind the curtains.
  • He was convinced that he would go to the end of the world.
  • If we look closely we can see a copy of lynx between the tree and the creek.
  • If you want to improve your work, you should head towards a greater specialization in the field of computer science.
  • All the children were playing in the park.

2-Adverbs are also invariable words

The adverbs are invariable words that work by adding different circumstances to prayer. That is, they always act as a circumstantial complement and show those conditions related to the verb they accompany. These circumstances are the time, the place, the way …

Below we show a series of sentences in which we have included adverbs in bold.

  • You learned how to do the exercise easily .
  • So we are not going anywhere.
  • The man was in front .
  • It was quite late to solve the problem they had caused.
  • Carmen’s haberdashery is the one behind the church, there you will find what you are looking for.
  • To rest we travel far from the city.


Interjections are also invariable words and are very easy to identify since they always appear between exclamation marks. These seek to show a state of mind or attract the attention of the listener. These are some examples:

  • Alto !
  • Ay ! Be more careful.
  • Bah ! That was already done by Raúl in ’98.
  • Cool ! I love the plan you have come up with.
  • Oh ! But what a handsome baby.
  • FABP ! I can’t stand insects!
  • Phew ! It sure is nothing.
  •  Eh ? What did you just say?


The conjunctions are invariable words and used different statements – law want to unite with each other. In other words, conjunctions are links that make it possible to make unions either of words, groups of words or different sentences. Conjunctions can be of various types. We are going to see the most representative and some examples of them:

  • Temporary : when, before, while … An example can be the following sentenceWhile I collect the clothes you can put another washing machine.
  • Finals : for… Let’s see an example. You have to raise your voice much higher to be heard in the back row.
  • Dilemmas : o, u… for example. Either choose red or green.
  • Copulatives : y, e, ni … we would find an example in the following sentence. I wish I could buy a sofa and two tables.
  • Consecutive : so, therefore, what, then … Let’s look at an example. I really liked the movie you recommended, so I ‘ve seen it twice.
  • Conditionals : yes … an example is the following sentence. Right now he would be working if he had studied the career he wanted.
  • Concessive : although… for example. He recognized that he was tired of that game even though it was he who proposed it.
  • Comparison : so, so much, that, like … For example. He is passionate about both classical and contemporary music.
  • Causes : because, for, like, well … An example. He actually did it because he felt like it.
  • Adversative : but, more, but … For example. He didn’t know how, but he managed to run away.

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