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| Type | If-clause | Main clause | Example |
|---|---|---|---|
| Zero | Present Simple | Present Simple | If you heat water, it boils |
| 1st | Present Simple | will + V1 | If it rains, I will stay |
| 2nd | Past Simple / were | would + V1 | If I were rich, I would help |
| 3rd | Past Perfect | would have + V3 | If I had studied, I would have passed |
| Mixed | Past Perfect | would + V1 | If I had taken medicine, I would be well |
| Statement | Tag |
|---|---|
| I am late | aren't I? |
| Let us go | shall we? |
| Let him go | will you? |
| Open the door | will you? |
| Everybody knows | don't they? |
| Nobody came | did they? |
| Nothing happened | did it? |
| He rarely comes | does he? |
| She hardly works | does she? |
| He never goes | does he? |
| There is a book | isn't there? |
| He used to play | didn't he? |
| One should try | shouldn't one? |