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| Rule | Formula | Example |
|---|---|---|
| Universal truth | Present Indefinite always | Sun rises in the east |
| Two past events | Earlier = Past Perfect | Had eaten before he came |
| Since | Point of time + Perfect/P.P.Cont. | since 2020 |
| For | Duration + Perfect/P.P.Cont. | for 5 years |
| If/When clause | Present (not future) | If it rains, I will stay |
| It is high time | Past tense | high time we changed |
| Wish/As if | Past/Were (subjunctive) | I wish I were rich |
| While | Continuous tense | While I was walking |