Multiple outer joins - error message

[Lipi]

Dear access forums,

I'm in a very high level of emergency. I have to finish a report system for tomorrow, and yet, just after beginning it, I've ran into a problem.

I have something a bit similar to:

------------------
Table 1: Shops /
----------------


- ID
- Name
- Type
------------------

------------------
Table 2: Trades /
-----------------
- ID
- Date
- Shop_ID
- Amount (currency)
------------------

I want to make a query, that takes data from both tables, lists all Shops even ones without any trades in the given month.
And well, that's what doesn't work: I want to only sum trades from a given month. I'm using an outer join for that:

SELECT Shops.Name
FROM Shops LEFT JOIN Trades ON Shops.ID = Trades.Shop_ID AND
 ON Trades.Date=[When?]
ORDER BY Shops.name;

But that doesn't seem to work. It keeps telling me:
Syntax error (missing operator) in query expression ".

Thank you very much for your help in advance!

[weekend00]

Code:
SELECT Shops.Name,sum(trades.amount) as sumtrade FROM Shops LEFT JOIN Trades ON Shops.ID = Trades.Shop_ID where Trades.Date=[When?]group by shops.name ORDER BY Shops.name;