| Wh-dependency | Island | Experimental sentences in |
| Main clause | None | Who thinks that [the lawyer forgot his briefcase at the office]? |
| Embedded clause | None | What do you think that [the lawyer forgot at the office]? |
| Main clause | Adjunct clause | Who worries if [the lawyer forgets his briefcase at the office]? |
| Embedded clause | Adjunct clause | What do you worry if [the lawyer forgets at the office]? |
| Main clause | None | Who heard that [Jeff baked a pie]? |
| Embedded clause | None | What did the chef hear that [Jeff baked]? |
| Main clause | Complex NP | Who heard the statement that [Jeff baked a pie]? |
| Embedded clause | Complex NP | What did the chef hear the statement that [Jeff baked]? |
| Main clause | None | Who thinks that [Matt chased the bus]? |
| Embedded clause | None | What does the police officer think that [Matt chased]? |
| Main clause | Indirect question | Who wonders whether [Matt chased the bus]? |
| Embedded clause | Indirect question | What does the police officer wonder whether [Matt chased]? |