If Clause Formula, Type 0,1,2,3
| If Clause | Main Clause |
| Zero Conditional(always) | |
| Present Simple Tense | Present Simple Tense |
| First Conditional (Present Tense or Future Tense) | |
| Present Simple Tense | Future Simple Tense(will + infinitive) |
| Present Simple Tense | Modal Verb + infinitive |
| Present Simple Tense | Imperative |
| Present Continuous Tense | Future Simple Tense (will + infinitive) |
| Second Conditional (Present Tense or Future Tense) | |
| Past Simple Tense | Conditional Simple (would + infinitive) |
| Past Simple Tense | Modal Verb + infinitive |
| Third Conditional (Past Tense) | |
| Past Perfect Tense (had + past participle) | Conditional Perfect (would + have + past participle) |
| Past Perfect Tense (had + past participle) | Modal Verb + have + past participle |
| Mixed Conditional (Past action, present result) | |
| Past Perfect Tense (had + past participle) | Conditional Simple (would + infinitive) |
| Past Perfect Tense (had + past participle) | Modal Verb + infinitive |
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