While some routers can be a client, your post is incomplete. So let's complete it.
Go get a WiFi BRIDGE and then use that to one of the LAN ports of this Belkin N WiFi router and then GOOGLE THIS!!! -> How to use a router as a WAP.
That works. I've done this!
I have a Belkin N wireless router, which I would like to connect to a wireless cable modem for networking my home as the wireless cable modem(netgear) is in a different place. How do I do it?