diff --git a/src/grammar.ts b/src/grammar.ts
index 164607d..b001e24 100644
--- a/src/grammar.ts
+++ b/src/grammar.ts
@@ -20,6 +20,7 @@ declare var determiner: any;
 declare var incorporated_determiner: any;
 declare var event_accessor: any;
 declare var focus_particle: any;
+declare var retroactive_cleft: any;
 declare var interjection: any;
 declare var name_verb: any;
 declare var text_quote: any;
@@ -51,6 +52,7 @@ const {
 	makeOptLeaf,
 	makePrefixLeaf,
 	makePrefixP,
+	makeRetroactiveCleft,
 	makeRose,
 	makeRose2,
 	makeSerial,
@@ -114,6 +116,7 @@ const grammar: Grammar = {
     {"name": "Clause", "symbols": ["DP", "Na", "CPrelna"], "postprocess": make3L('𝘷P', "𝘷'")},
     {"name": "Clause", "symbols": ["ModalP", "Na", "MTP"], "postprocess": make3L('𝘷P', "𝘷'")},
     {"name": "ModalP", "symbols": ["ModalT4", "CPsub"], "postprocess": makeBranch('ModalP')},
+    {"name": "Clause", "symbols": ["MTP", "Go", "Clause"], "postprocess": makeRetroactiveCleft},
     {"name": "MTP", "symbols": ["TP1"], "postprocess": id},
     {"name": "MTP", "symbols": ["Modal", "TP1"], "postprocess": makeT1ModalvP},
     {"name": "MTP", "symbols": ["Sigma", "Modal", "TP1"], "postprocess": makeSigmaT1ModalvP},
@@ -211,6 +214,7 @@ const grammar: Grammar = {
     {"name": "Dincorp", "symbols": [(lexer.has("incorporated_determiner") ? {type: "incorporated_determiner"} : incorporated_determiner)], "postprocess": makeLeaf('D')},
     {"name": "EvA", "symbols": [(lexer.has("event_accessor") ? {type: "event_accessor"} : event_accessor)], "postprocess": makeLeaf('EvA')},
     {"name": "Focus", "symbols": [(lexer.has("focus_particle") ? {type: "focus_particle"} : focus_particle)], "postprocess": makeLeaf('Focus')},
+    {"name": "Go", "symbols": [(lexer.has("retroactive_cleft") ? {type: "retroactive_cleft"} : retroactive_cleft)], "postprocess": makeLeaf('𝘷')},
     {"name": "Interjection", "symbols": [(lexer.has("interjection") ? {type: "interjection"} : interjection)], "postprocess": makeLeaf('Interjection')},
     {"name": "Mi", "symbols": [(lexer.has("name_verb") ? {type: "name_verb"} : name_verb)], "postprocess": makeLeaf('mı')},
     {"name": "Mo", "symbols": [(lexer.has("text_quote") ? {type: "text_quote"} : text_quote)], "postprocess": makeLeaf('mo')},
diff --git a/src/toaq.ne b/src/toaq.ne
index f226ea1..45bab96 100644
--- a/src/toaq.ne
+++ b/src/toaq.ne
@@ -15,6 +15,7 @@ const {
 	makeOptLeaf,
 	makePrefixLeaf,
 	makePrefixP,
+	makeRetroactiveCleft,
 	makeRose,
 	makeRose2,
 	makeSerial,
@@ -71,6 +72,8 @@ Clause -> DP Na CPrelna {% make3L('𝘷P', "𝘷'") %}
 # shê ꝡä hao nä jıa hao
 Clause -> ModalP Na MTP {% make3L('𝘷P', "𝘷'") %}
 ModalP -> ModalT4 CPsub {% makeBranch('ModalP') %}
+# hao jí gö hao jí
+Clause -> MTP Go Clause {% makeRetroactiveCleft %}
 
 # "MTP" is a TP that can have a t1 modal in front.
 
@@ -188,6 +191,7 @@ D -> %determiner {% makeLeaf('D') %}
 Dincorp -> %incorporated_determiner {% makeLeaf('D') %}
 EvA -> %event_accessor {% makeLeaf('EvA') %}
 Focus -> %focus_particle {% makeLeaf('Focus') %}
+Go -> %retroactive_cleft {% makeLeaf('𝘷') %}
 Interjection -> %interjection {% makeLeaf('Interjection') %}
 Mi -> %name_verb {% makeLeaf('mı') %}
 Mo -> %text_quote {% makeLeaf('mo') %}
diff --git a/src/tree.ts b/src/tree.ts
index 203c0c0..620cc3d 100644
--- a/src/tree.ts
+++ b/src/tree.ts
@@ -395,3 +395,19 @@ export function makePrefixP([prefix, verb]: [Tree, Tree]) {
 		right: verb,
 	};
 }
+
+export function makeRetroactiveCleft([tp, vgo, clause]: [Tree, Tree, Tree]) {
+	return {
+		label: '𝘷P',
+		left: { label: 'CP', left: { label: 'C', word: 'covert' }, right: tp },
+		right: {
+			label: "𝘷'",
+			left: vgo,
+			right: {
+				label: 'CPrel',
+				left: { label: 'C', word: 'covert' },
+				right: clause,
+			},
+		},
+	};
+}