Word grammar error

[grammar error]

Grammar checker is incorrect on this type:
A large number of teachers was in attendance. Verb agrees with "a...number"
which is singular, not withthe plural "teachers."

----------------
This post is a suggestion for Microsoft, and Microsoft responds to the
suggestions with the most votes. To vote for this suggestion, click the "I
Agree" button in the message pane. If you do not see the button, follow this
link to open the suggestion in the Microsoft Web-based Newsreader and then
click "I Agree" in the message pane.

http://www.microsoft.com/office/com...4&dg=microsoft.public.word.application.errors

 

[Suzanne S. Barnhill]

"A number" can be plural; "the number" is always singular.

Grammar checker is incorrect on this type:
A large number of teachers was in attendance. Verb agrees with "a...number"
which is singular, not withthe plural "teachers."

----------------
This post is a suggestion for Microsoft, and Microsoft responds to the
suggestions with the most votes. To vote for this suggestion, click the "I
Agree" button in the message pane. If you do not see the button, follow this
link to open the suggestion in the Microsoft Web-based Newsreader and then
click "I Agree" in the message pane.

http://www.microsoft.com/office/com...4&dg=microsoft.public.word.application.errors

 

[Grobet Myttelson]

Have a look here for instance (rule 5):

http://www.utoronto.ca/writing/l2agr.html