We did not see him yesterday, so we did not tell him about it.
If we had seen him yesterday, we would have told him about it.
She was ill, so she did not go to work.
If she had not been ill, she would have gone to work.
They are busy, so they will not visit me.
If they were not busy, they would visit me.
I did not listen to my teacher carefully, so I did not understand a new grammar rule.
If I had listened to my teacher carefully, I would have understood a new grammar rule.
She did not go to school yesterday, so she did not meet her friends there.
If she had gone to school yesterday, she would have met her friend there.
They do not have tickets for the concert, so they stay at home.
If they had tickets for the concert, they would not stay at home.
They have a lot of heavy bags, so they can not walk.
If they did not have a lot of heavy bags, they could walk.
It was cloudy yesterday, so we did not sunbath.
If it had not been cloudy yesterday, we would have sunbathed.
I did not turn on the light, so I fell over.
If I had turned on the light, I would not have fallen over.
The weather was terrible last Sunday, so we canceled our trip.
If the weather had not been terrible last Sunday, we would not have canceled the trip.
She did not prepare for the exam, so she did not pass i
If she had prepared for the exam, she would have passed it.
She did not take money with her, so she could not buy herself a cup of coffee.
If she had taken money with her, she could have bought herself a cup of coffee.
I did not take my camera, so I did not shoot the dawn.
If I had taken my camera, I would have shot the dawn.
I was not at work yesterday, so I did not finish the report.
If I had been at work yesterday, I would have finished the report.
We were busy yesterday, so we did not meet you at the station.
If we had not been busy yesterday, we would have met you at the station.
We are ill, so we can not take part in the race.
If we were not ill, we could take part in the race.
He fell asleep, so he did not watch the news.
If he had not fallen asleep, he would have watched the news.
He did not prepare for the test, so he failed it.
If he had prepared for the test, he would not have failed it.
He does not know English, so he can not get a better job.
If he knew English, he could get a better job.
They did not invite me to the party, so I did not go.
If they had invited me to the party, I would have gone.