1. Regret now, a desired change in the past
If only expresses a wish for a different past. The event has already happened or the opportunity has passed; we imagine the desired alternative.
This does not report that the desired action actually happened. Identify the real fact first, then what the speaker would like to change.
If only + subject + had + V3
- subject / S —
- The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
- V3 / past participle —
- The third verb form: worked, gone, seen. Used after have/has or in the passive, for example; it is not always the same as V2.
If only I had kept the ticket.
If only I had kept the ticket.
The ticket was not kept; keeping it is the desired version of the past.
If only we had left earlier.
If only we had left earlier.
The wish concerns leaving earlier, not the absence of any departure.
2. One form for every subject
After If only, place the subject, then had and the verb’s third form: had checked, had taken, had written. Had does not change with I, you, he, she, it, we or they.
The order is declarative: If only she had… It is not the question Had she… Irregular verbs require V3: take — taken, write — written, see — seen.
If only + I / you / he / she / it / we / they + had + V3
- V3 / past participle —
- The third verb form: worked, gone, seen. Used after have/has or in the passive, for example; it is not always the same as V2.
If only she had written the address clearly.
If only she had written the address clearly.
Written is the third form of write; she does not change had to has.
If only you had taken a warmer coat.
If only you had taken a warmer coat.
Regret can concern the other person’s action. After had, use taken, not took.
3. Negation describes the desired alternative
If only I hadn’t… means the action happened, but the speaker wishes it had not. The full had not and contracted hadn’t convey the same meaning.
Sometimes the same desired change can be expressed positively or negatively: not throwing something away or keeping it. Check the meaning, not merely the presence of not.
If only + subject + had not / hadn’t + V3
- subject / S —
- The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
- V3 / past participle —
- The third verb form: worked, gone, seen. Used after have/has or in the passive, for example; it is not always the same as V2.
If only I hadn't deleted the photo.
If only I hadn't deleted the photo.
The photo was deleted. Negation belongs to the imagined desired alternative.
If only I had kept the box.
If only I had kept the box.
If the box was thrown away, If only I hadn’t thrown away the box is also possible.
4. Been, had had and the contraction ’d
For a desired past state with be, use had been. For have meaning possession, use had had: the first had forms the tense, the second is the main verb’s third form.
I had can contract to I’d: If only I’d known. In other constructions, ’d can mean would; the whole construction establishes its meaning, not the apostrophe alone.
If only I had been more patient.
If only I had been more patient.
The regret concerns behaviour in a past situation; been is V3 of be.
If only we had had more time.
If only we had had more time.
The desired additional time belongs to the past. Both occurrences of had are needed.
If only I'd brought my glasses.
If only I'd brought my glasses.
Here I’d brought = I had brought: brought completes the Past Perfect.
5. Do not confuse a past wish with a present wish
After If only, Past Simple usually describes a desired change in the present. For regret about a completed past situation, use Past Perfect.
If only I didn’t say that to her can be a grammatical wish not to have that habit now. It is not a universal example of a grammatical error. Particular words already said require the past perspective: hadn’t said.
Words such as more, earlier and more carefully matter too: regret about insufficient effort does not mean there was no effort at all.
If only I had more time now.
If only I had more time now.
The single had here is the past form of have expressing a present wish.
If only I had had more time yesterday.
If only I had had more time yesterday.
Had had places the desired resource in a completed past situation.
If only I had studied harder for the test.
If only I had studied harder for the test.
The speaker wishes for more effort; that does not imply there was no studying at all.
6. Expressiveness, support and the next step
If only often sounds more emotional than I wish, but it is not an exact scale of emotional strength. Intonation and situation matter too. A full stop or exclamation mark is possible; an exclamation mark is not compulsory grammar.
The utterance can stand alone: adding a conditional result with would have is unnecessary. Regret about someone’s absence is not necessarily a reproach.
The past fact cannot change, but its consequences can sometimes be corrected. After expressing regret, it is natural to name a present action or future plan in another appropriate tense.
If only you had been there with us.
If only you had been there with us.
This can warmly express regret about a friend’s absence without blaming them.
If only I had checked the date. I can send a new message now.
If only I had checked the date. I can send a new message now.
The regret concerns a past check; a present correction of the consequence is still possible.
Common mistakes
Incorrect:If only we had leave earlier.
Correct:If only we had left earlier.
After had, use the third form left, not the base form leave.
Incorrect:If only she had saw the note.
Correct:If only she had seen the note.
Saw is the second form. Past Perfect needs the third form seen.
Incorrect:If only I had not went there.
Correct:If only I had not gone there.
Negation does not change the V3 requirement: use gone, not went.
Incorrect:If only he had was there.
Correct:If only he had been there.
After had, be takes the form been, not was.