Missed several errors. Suprise is wrong tense, there 10-30% is missing vrerb, reason should be plural

## Description

This sentence has several errors not caught by Harper. "I wouldn't be surprise to find that there 10-30% of Peacemaker fans haven't seen Superman for a variety of reason."

Surprise should be surprised (past participle needed for correct grammar)

"there 10-30%" → should be "that 10–30%" or "there are 10–30%" (missing verb; "there" was incorrectly used instead of "that" or needed "are").

"reason" → should be "reasons" (plural form to match "a variety of").

No files or tests are named. Reproduce the quoted sentence in Harper, then locate the grammar rules and tests covering participles, that/there/are usage, and plural agreement; done means the reported errors are detected without regressing nearby cases.

Written by the indexing model from the issue text.