| That-clause | that + subject + verb; that drops after common verbs | I know (that) he left. |
| Wh-clause | wh-word + subject + verb; no do, does or did | Tell me where he lives. |
| If and whether | if or whether after ask and wonder; whether after a preposition or to | I wonder whether she knows. |
| Wh-word and to | wh-word + to + V | I don't know what to do. |
| Embedded question | a polite question starts Could you tell me and keeps statement order | Could you tell me where the station is? |
| -ever words | words in -ever mean any person, thing, time, place or way that | Take whatever you like. |
| Exclamation | what or how opens it; the subject comes before the verb | I can't believe how beautiful it is. |
| C1Noun and clause | the noun names what the clause says: the fact that, the question whether | Despite the fact that it was late, we stayed. |
| C1After be | The problem is, This is why, That's what + clause | The problem is where to park. |
| C1After a preposition | a wh-word or whether follows; before that the preposition drops | It depends on whether we can park. |
| C1Verbs of demand | insist / demand / recommend + that + subject + base verb; British English often adds should | She recommends that he rest. |
| Trap | a noun clause keeps statement order, with no do | I don't know where the station is. |