Since your file is a rip (likely from YTS/YIFY), look specifically for subtitles labeled "BluRay" or "YIFY" to ensure the timing matches the frame rate and avoids "sync drift" (where the text appears too early or late).
: Keep both the video and the subtitle file in the same folder. subtitle Patriots.Day.2016.720p.BluRay.x264.[YT...
: Search for "Patriots Day 2016 720p BluRay x264 YTS subtitles" on reputable subtitle sites like OpenSubtitles or Subscene. Since your file is a rip (likely from