What do you think of this guy's pronunciation?

<<"I don't know him," answered a man eating an ice-cream cone on a park bench. A young mother, approached with the same question, clutched her baby and scurried away. A teen-ager asked if he was seeking a "gay man," and another directed him to a gardener.>>

LOL

«私はこの英会話の発音とリスニングをインターネットで公開したいと思ったのは大きな理由があります。»

K.T., you don't need an adjective to describe reason in this sentence. It just doesn't sound right! It would be better to leave out big (which, I don't understand why a reason would be large). Otherwise, very good Japanese.