First
I won't invite her if she doesn't apologise to me.
Unless she apologises to me, I won't invite her.
She knows a lot about science because she watched a lot of documentaries.
If she didn't watch a lot of documentaries, she wouldn't know a lot about science.
We got lost last night because we forgot the GPS.
If we hadn't forgotten the GPS we wouldn't have got lost.
He lost his job. He's unemployed now.
If he hadn't lost his job, he wouldn't be unemployed now.
If he hadn't lost his job, he would be employed now.
She doesn't have a mobile phone. That's why she couldn't be contacted yesterday.
If she had a mobile phone, she could have been contacted yesterday.
You will understand the text if you read it thoroughly.
You won't understand the text unless you read it thoroughly.
There are too many cars. As a result, our planet is polluted.
If there weren't so many cars, our planet wouldn't be polluted.
You ate the whole cake. That's why you threw up.
If you hadn't eaten the whole cake, you wouldn't have thrown up.
His pet died. That's why he's unhappy now.
If his pet hadn't died, he wouldn't be unhappy now.
If his pet hadn't died, he would be happy now.
She doesn't speak French. She didn't have a good time in Paris.
If she spoke French, she would have had a good time in Paris.
Unless it's cold, we'll have the party outdoors.
They do not have tickets for the concert, so they stay at home.
If they had tickets for the concert, they wouldn't stay at home.
If Sarah hadn't overslept, she would have attended the class.
Tom didn't see his boss earlier. He's waiting for him now.
If Tom had seen his boss earlier, he wouldn't be waiting for him now.
I have a lot of work. I didn't go to the party last weekend.
If I didn't have a lot of work, I would have gone to the party last weekend.
Unless you kick the ball very hard, it won't reach its goal.
If you don't kick the ball very hard, it won't reach its goal.
I can't find my glasses. I can't read the newspaper.
If I found my glasses, I could read the newspaper.
We only came by bus because there were no taxis.
If there had been taxis, we wouldn't have come by bus.
They went to a party last night. That's why they're tired now.
If they hadn't gone to a party last night they wouldn't be tired now.
I don't have enough money so I didn't go to Spain.
If I had enough money, I would've gone to Spain.
You shouldn't eat fish unless it's fresh.
You shouldn't eat fish if it's not fresh.
I suggest asking the police for directions.
If I were you, I would ask the police for directions.
I didn't go to see Helen because I didn't know she was in the hospital.
If I had known she was in the hospital, I would've gone to see her.
Frank is not going to come to the dinner tomorrow because you had insulted him yesterday.
Frank would come to the dinner tomorrow if you hadn't insulted him yesterday.
The weather is bad so we didn't enjoy the holidays.
If the weather wasn't bad (or was good), we would have enjoyed the holidays.