[FairOpinion]

Well, if the person is an American, who learned Arabic, like Johnny Taliban, that could explain the grammatical errors in Arabic.

"US intelligence officials believe the man on tape may be Adam Gadhan - aka Adam Pearlman, a California native who was highlighted by the FBI in May as an individual most likely to be involved in or have knowledge of the next al Qaeda attacks.

According to the FBI, Gadahn, 25, attended al-Qaida training camps and served as an al-Qaida translator."

From Drudge: http://www.drudgereportarchives.com/data/2004/10/28/20041028_013203_abct.htm

AND


http://www.fbi.gov/terrorinfo/gadahn.htm

Place of Birth: United States

[Godzilla]

Well, if the person is an American, who learned Arabic, like Johnny Taliban, that could explain the grammatical errors in Arabic

The point is that the tape claims to have been produced by Sahab productions, the propaganda arm of AQ, staffed with lots of literate arabs. If this is bogus, then grammatical errors would be expected.