English Grammar Pill: How to use whether or if correctly (+ quick conditionals review).


Whether or if – that is the question.

These two little words can cause a lot of confusion to both learners and fluent speakers of English in both spoken and written English. So, I thought I would clarify the misunderstanding in this post.

And to help me, I have this excellent infographic prepared by the team at Grammar.net that clearly shows how to use “whether” and “if” correctly.

However, before we get to look at the difference between “whether” and “if”, there is a brief explanation of the English conditional tenses in the infographic. I am going to go through the visual and show you how to use the tenses correctly before dealing with “whether” and “if”.

We use “if” in what we sometimes call in grammar the “if clauses” that form part of the conditional tenses. The “if” part of the sentence is the condition whilst the second part of the sentence is the result.

“If you run too fast (condition), you get out of breath (result)”

There are four conditional tenses in English – the zero, first, second and third. Most learners are familiar with the first and second. Some of my clients get confused with the third conditional and most people don’t even know about the zero! Let’s take a look at each one in turn.

[Infographic provided by Grammar.net]

Compare these sentences.

  • If sales increase (generally), we make a profit.
  • If sales increase (next quarter), well make a profit.
  • If sales increased (next quarter), we would make a profit.
  • If sales had increased (last quarter), we would have made a profit.

When we talk about things that are always or generally true, we use the zero conditional.

Structure: If/when + present tense, present tense

  • If/when you fly business class, you get more legroom.
  • If you eat too much, you get fat. 
  • When we have a lot of orders, we always employ extra staff.

When we talk about future events that will happen or has a real possibility of happening we use the first conditional.

Structure: If/when + present, future

  • If Bob comes over, we will watch the game.” (there is a good chance that Bob will come over)
  • If the product is successful in China, we will introduce it into other Asian markets” (there is a high chance that the product will be successful)
  • If I have time this afternoon, I’ll go for a run.” 

In this situation we refer to future events that are unlikely to happen or impossible. We also call this “imaginary future”. We use this tense to imagine and dream of a future that’s different to our present. 

Structure: If  + past simple, would/could/might + verb (infinitive)

  • “If I went to the moon, I would know whether it is made of cheese.” (You are not likely to go to the moon so this situation is not real)
  • “If I were a boy, I’d roll outta (out of) bed in the morning” (lyric from Beyonce’s song “If I were a boy”  Reality= I am a girl not a boy)
  • If I won the lottery, I’d buy a yacht.” ( Reality = I haven’t won the lottery)


When we talk about past events that are different from what really happened we used the third conditional. This is also known as the imaginary past. This is often used to express regret and sometimes criticism.

Structure: If + past perfect, would + have + past participle

  • If Jill had gone to the zoo, she would have taken pictures.” (Reality: Jill didn’t go to the zoo, so she didn’t take any pictures)
  • If I had known about your problem, I would have helped you.” (Reality: I didn’t know about your problem so couldn’t help)
  • If I had done an MBA, I would have had more opportunities in my career.” (Reality: I didn’t do the MBA so I’ve had few opportunities)

The above examples are about two actions in the past. If the result clause is in the present, we use would + infinitive:

  • If I had done an MBA, I would be on a higher salary now”.


These are often interchanged but actually have different uses.
Here are a couple of examples how they can be used interchangeably.

James didn’t know whether Helen would arrive on Friday”.
“James didn’t know if Helen would arrive on Friday”. 

In either sentence, Helen may or may not arrive on Friday so the meaning is the same.

However, they have different uses in the following situations.

When a result depends on a specific condition, we use “IF”.

  • “We will go for a walk if it doesn’t rain”.
  • “I’ll take Buster for a longer walk if I have time”.
  • If you finish your dinner, you can have some pudding.”

Choices or alternatives
shows choices or alternatives and generally requires an “or.” “Or not” is often used for yes/no choices. “Whether” by itself can hint at both positive and negative possibilities.

  • “Tell Rachel whether you want chicken or beef for dinner.”
  • “Whether or not you are going to the party, please call.”
  • “Let us know whether the school is open.”

So, remember:

Photo: Grammar Girl
Photo: Grammar Girl


Sources: Grammar Girl, Business Grammar Builder, Paul Emmerson (2010), Macmillan


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26 thoughts on “English Grammar Pill: How to use whether or if correctly (+ quick conditionals review).”

  1. As a student said to me: “Please tell me if I should use ‘whether’, or whether I should use ‘if'”. 😉

    BTW, Shanthi, I think the example of the moon I the second conditional should technically use ‘whether’, shouldn’t it? Nitpicking I know.

    Anyway, thanks for the grammar pill. One of my students just asked for sth on conditionals so you have great timing :)


    1. You’re right, Tim. The example was given by Grammar net. I should have checked it first. I shall amend it now. :-)

  2. how about this sentence
    if there was a meeting, I would go home soon. is it true or it should be
    if there were a meeting, I would go home soon?

    1. Hi Mia,

      Either sentence is NOT correct. For people and objects using the second conditional, the verb “to be” is always conjugated as “were”.

      For example, if I were, if you were, if we were, if they were…
      and if it were.

      So, the only correct sentence out of those two would be:

      If there were a meeting, I would go home soon.

      Good question!

      1. I have to beg to differ with you on this one, Morgyn.
        Whilst saying “I were you” is more correct, using ” if I was you” is no longer considered incorrect in modern English usage.

  3. I found it all interesting.I was a little duvious at first, but now I understood it Quite well.

  4. The 3rd Conditional is the hardest to use for our students.I’d also add that there are more than 4 types of Conditionals.The mixed types.Another post could present the use of them.Thanks a lot for your useful posts.Always welcome!!!

  5. Thanks a lot for such a nice material about If and Whether. I found it very useful for me in my work for this moment.

  6. I love this blog mam. this blog quite interesting to learn. If you post reporting speech it would more help full mam. Thanking you.

  7. Dear Shanthi,

    Your post helped me understand finally how can I use 2-3 conditionals! This explanation so clear and understandable: ” … (next quarter), …(last quarter)…” Sometimes the simpliest things are the best! Thanks a lot :)
    Could you give us some other help how to navigate among mixed conditionals?

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