general conduct

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Sir, you had sent a word with my son to come and see you.
  2. How is his general conduct?
  3. He is very well behaved. No need to worry about that.
  4. What do you suggest for improving his English?
    Please correct all.
    Thanks.
2
  1. Sir, you had sent word with my son to come and see you. - no article

You are telling someone what they should already know, so I wonder if you fully understand this sentence. Possibly you just chose the wrong tense and intended the speaker to explain why he had just come:
Sir, you sent word with my son to come and see you.