LinqToSQL, Repository, Asscociations

I have 2 tables in my database

JobTab has fields jobid int, jobloggedbyid int, jobstate int
JobUser has fields userid int, username, userisactive bit

JobTab jobloggedbyid is a foreign key to userid on on jobusers.

using lingtosql i have added both tables to the dbml, and created the association for the foreign key.

I have IRepository interface with method
Get(ByVal predicate As Expression(Of Func(Of T, Boolean))) as IQueryable(Of T)

I have 2 concrete Repository's, JobTabRepository and JobUserRepository both implement IRepository

so in the JobTabRepository  which implements IRepository(Of JobTab)

Get(some predicate here) will return a iqueryable(of jobtab).

and JobUserRepository Get(some preditcate) will return IQueryable(of JobUser)

perfectly fine to this point....

now I want to add a method to the JobTabRepository that will return me the JobTab records from the database based on whatever criteria I pass to the predicate, but I want to show the username not the loggedbyid in my final datagrid where the results end up so in essence the result should be the JobTab with its associated JobUser, I wanted to keep the return type of the method as IQueryable(of JobTab) so it keeps the Repository nice and neat, but I cant figure out how to do it keeping the return type a IQueryable(of JobTab).

sorry if this sounds like a lame question, maybe i am just being to strict with what i return from my repository, maybe repository isn't the correct way to go for this problem and i should be looking at something like CQS, I am very new to linqtosql and its associated patterns, but any help would be very much appreciated.

Thanks