If that happened vs If that happen

Both phrases are correct, but they are used in different contexts. 'If that happened' is the correct phrase to use when referring to a past hypothetical situation. 'If that happen' is the correct phrase to use when referring to a present or future hypothetical situation.

Last updated: March 20, 2024

If that happened

This phrase is correct and commonly used in English when referring to a past hypothetical situation.

This phrase is used to talk about a hypothetical situation that occurred in the past. It is often followed by a consequence or result.

Examples:

If that happened, I would have been so surprised.
If that happened yesterday, we missed a great opportunity.

Show examples from the web [+]

If that happened to my best friend, I'd stay.
If that happened, they would have gotten us by now.
Be funny if that happened again.
I guess if that happened, you would be burned.
It'd be a shame if that happened to you.
And if that happened, would France have to follow Russia and...
If that happened, the barn would've sent out a pulse.
If that happened to me, Pat or Ronnie, I wouldn't be much in the mood for talking it out.
If that happened to me and there was nothing I could do about it,
We'd have heard if that happened.
I'd die if that happened to me.
I'm just thinking if that happened to one of my kids.
So the judge and I agreed... if that happened, we'd talk.
I know if that happened to me, I would be hurt and furious and sad and worried.
and what I would do if that happened.
She warned me that she may become unavailable, and if that happened, I was to contact you this way.
I'd know if that happened.
I'm crying because what if that happened in front of our kid?
We had an electrical short over at the site, and it may be disrupting people's phone service, and we're wondering if that happened
Besides, I think I'd remember if that happened, right?

Alternatives:

if that had happened
if that were to happen
if that had taken place
if that had occurred
if that had transpired

If that happen

This phrase is correct and commonly used in English when referring to a present or future hypothetical situation.

This phrase is used to talk about a hypothetical situation that is currently happening or might happen in the future. It is often followed by a consequence or result.

Examples:

If that happen, we should be prepared.
If that happen tomorrow, it will be a disaster.

Alternatives:

if that were to happen
if that were to occur
if that were to take place
if that were to transpire
if that were to come to pass

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If that happened vs If that happen

If that happened

If that happen

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