Linq Using Join SQL Syntax Question?

I am new to Linq, and I am having trouble grasping the syntax with respect to multi-table joins. I have three tables... workItem, workItemTemplate, and skill. A workItem has a particular kyworkItemTemplate which is used as a foreign key to the workItemTemplate table. A workItemTemplate has a kyWorkItemType which joins it to a skills table. Each row in the skills table indicates a workItemType that a user can perform.

The SQL that does what I want looks like this...

select s.*

from workitem w

inner join workitemtemplate t

on w.kyworkitemtemplate = t.kyworkitemtemplate

inner join skill s

on t.kyworkitemtype = s.kyworkitemtype

where s.kyUser = 'e158177'

and w.kyworkitem = 138

OR

select s.*

from workitem w, workitemtemplate t, skill s

where w.kyworkitemtemplate = t.kyworkitemtemplate

and t.kyworkitemtype = s.kyworkitemtype

and s.kyUser = 'e158177'

and w.kyworkitem = 138;

If either of these retorns a row, I know that employee e158177 has the skills to work the particular workItem #138. Can anyone help me out with the Linq syntax?