-Infomation is an uncountable noun so you have to use the word some before it, not a
-Biscuit is a countable noun so you can use a before it
-You use these following structure to describle sb has the abilily to do sth:
-You can't use the verb "say" here. you can use "tell"
-The man is a human, so you have to replace "which" with "who" or "whom"
Hope this helpful to you
Student or Learner