Complete each sentence with the correct verb form.
| Type | Usage | Structure | Example | | :--- | :--- | :--- | :--- | | | General truths/facts | If + Present Simple, Present Simple | If you heat ice, it melts. | | First | Real possibilities in the future | If + Present Simple, will + Verb | If it rains, I will stay home. | | Second | Unreal/hypothetical present | If + Past Simple, would + Verb | If I won the lottery, I would travel. | | Third | Unreal/hypothetical past (regrets) | If + Past Perfect, would have + V3 | If I had studied, I would have passed. | | Mixed | Hypothetical past -> present result | If + Past Perfect, would + Verb | If I had eaten breakfast, I wouldn't be hungry now. |