Use descriptive explanation for "whom" rule

vendor/parser/rule.go

@@ -33,8 +33,17 @@ var why_reason = map[string]string{
 	"of":          "‘of’ is not a verb like ‘have’ is",
 	"your-are":    "‘your’ is a possessive determiner; ‘you’ is a pronoun",
 	"supposed-to": "‘supposed’ is a participle, not a bare infinitive",
-	"whom":        "unlike ‘whom’, ‘who’ is a subject",
 	"allot-of":    "‘allot’ is a verb; ‘a lot’ is a noun or adverb",
+
+	"whom_is":        "unlike ‘whom’, ‘who’ is the subject of ‘is’",
+	"whom_am":        "unlike ‘whom’, ‘who’ is the subject of ‘am’",
+	"whom_are":       "unlike ‘whom’, ‘who’ is the subject of ‘are’",
+	"whom_was":       "unlike ‘whom’, ‘who’ is the subject of ‘was’",
+	"whom_were":      "unlike ‘whom’, ‘who’ is the subject of ‘were’",
+	"whomever_is":    "unlike ‘whomever’, ‘whoever’ is the subject of ‘is’",
+	"whomever_was":   "unlike ‘whomever’, ‘whoever’ is the subject of ‘was’",
+	"whomsoever_is":  "unlike ‘whomsoever’, ‘whosoever’ is the subject of ‘is’",
+	"whomsoever_was": "unlike ‘whomsoever’, ‘whosoever’ is the subject of ‘was’",
 }
 
 type word *sequence.Word
@@ -52,7 +61,7 @@ func (r *ruleMatcher) Matched(reason string) {
 		return
 	}
 	r.matched[reason] = struct{}{}
-	why := "[ERROR]"
+	why := "[THERE WAS AN ERROR GENERATING AN EXPLANATION]"
 	if reasonText, ok := why_reason[reason]; ok {
 		why = reasonText
 	}

vendor/parser/rule_whomBe.go

@@ -30,12 +30,14 @@ func (r *ruleMatcher) rule_whomBe(cur *sequence.Word) {
 		next1New = "is"
 	}
 
-	switch cur.Lower {
+	rule := cur.Lower
+
+	switch rule {
 	case "whomever":
 		cur.ReplaceCap("whoever")
 	case "whomsoever":
 		cur.ReplaceCap("whosoever")
-	default:
+	default: // "whom"
 		if r.HasPrevInSentence(1) {
 			switch r.PrevWord(1).Lower {
 			case "i", "me", "myself":
@@ -70,5 +72,5 @@ func (r *ruleMatcher) rule_whomBe(cur *sequence.Word) {
 	if next1.Lower != next1New {
 		next1.Replace(next1New)
 	}
-	r.Matched("whom")
+	r.Matched(rule + "_" + next1New)
 }