検出した問題: 2 件
  [AGREEMENT_SENT_START] 'This' seems to be used as a plural or subject pronoun, but the verb is singular. Use 'These' instead.
    修正候補: ['These']
  [NOUN_VERB_CONFUSION] Did you mean 'errors' (plural noun) instead of 'error'?
    修正候補: ['errors']
修正後: These are bad sentences with many errors in it.