Update app.py

app.py

@@ -2292,6 +2292,77 @@ def build_single_sign_bracketed(tagged_list, mode="ccv"):
 
 ###############################################################################
 
+###############################################################################
+def fix_subject_verb_agreement(sent: str) -> str:
+    """
+    If the finite verb is present plural (VBP) but the subject is singular,
+    rewrite the verb to singular present (lives, is, has, …).
+    """
+    doc = nlp(sent)
+    if not doc:
+        return sent
+
+    # Find root verb
+    root = None
+    for t in doc:
+        if t.dep_ == "ROOT" and t.pos_ in ("VERB", "AUX"):
+            root = t
+            break
+    if root is None:
+        return sent
+
+    # Only repair present non-3sg forms that look plural/base
+    if root.tag_ not in ("VBP", "VB"):
+        return sent
+
+    # Collect nsubj / nsubjpass text
+    subj_tokens = [t for t in root.lefts if t.dep_ in ("nsubj", "nsubjpass")]
+    if not subj_tokens:
+        return sent
+
+    subj = subj_tokens[0]
+    # Coordinated subject still plural → leave alone
+    if any(t.dep_ == "cc" for t in subj.subtree):
+        return sent
+
+    singular = subj.tag_ in ("NN", "NNP", "PRP") and subj.lower_ not in (
+        "i", "you", "we", "they",
+    )
+    # "I/you" take VBP; don't force -s
+    if subj.lower_ in ("i", "you", "we", "they"):
+        return sent
+    if not singular and subj.tag_ not in ("NN", "NNP"):
+        # Heuristic: plural NNS / NNPS → keep verb
+        if subj.tag_ in ("NNS", "NNPS"):
+            return sent
+
+    if not singular and subj.tag_ not in ("NN", "NNP", "PRP"):
+        return sent
+
+    # Map verb → 3sg present
+    irregular = {
+        "are": "is", "were": "was", "have": "has", "do": "does",
+        "go": "goes", "do": "does",
+    }
+    lemma = root.lemma_.lower()
+    form = root.text
+    lower = form.lower()
+
+    if lower in irregular:
+        new = irregular[lower]
+    elif lower.endswith(("s", "sh", "ch", "x", "z", "o")):
+        new = lower + "es"
+    elif lower.endswith("y") and len(lower) > 1 and lower[-2] not in "aeiou":
+        new = lower[:-1] + "ies"
+    else:
+        new = lower + "s"
+
+    if form[0].isupper():
+        new = new[0].upper() + new[1:]
+
+    # Splice back into the sentence using character offsets
+    return sent[: root.idx] + new + sent[root.idx + len(root.text) :]
+###############################################################################
 
 ###############################################################################
 @spaces.GPU(duration=120)