RRGbank

To change a label, click on a node to select a different label from a list. The syntactic category and the function tag (before and after the dash "-") must be selected separately by clicking on the corresponding part of the label.
To add a function tag to a node that does not have one yet, drag it from the list of function tags onto the node.
Re-attach a node by dragging and dropping it on a new parent. This can be used to created discontinuous constituents.
Similarly, nodes can be removed and new ones added by dragging to/from below the tree.
Finally, the bracketing can be edited manually in the text box below the tree; press "validate" to update the tree. Whitespace is ignored. Each token must have a dedicated POS tag.

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Supertags

	token	arc	supertag
1	``	0	(SENTENCE (`` <>))
2	That	3	(NP (PRO-DEM <>))
3	is	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (AUX-TNS <>)))))
4	what	10	(NP-WH (PRO-WH <>))
5	Common	6	(NUC_N* (N-PROP <>))
6	Cause	8	(NP (CORE_N (NUC_N (N-PROP <>))))
7	should	8	(CORE* (OP-MOD <>))
8	ask	10	(CLAUSE (CORE (NP ) (NUC (V <>)) (CORE )))
9	be	10	(NUC* (AUX <>))
10	investigated	3	(NUC* (AUX-TNS (CLAUSE (PrCS (NP-WH )) (CORE#WRAP# (NUC (V <>))))))
11	.	0	(SENTENCE (. <>))