Can I use my smartphone as a WiFi network adapter? I have this PC that doesn't support wiFi and I have to use usb tethering. 
But I want to see if I can project my phone's WiFi onto the computer, so it can see all the available wireless networks, whilst its still connected to USB.

I don't know how much difference this would be considering, even if I projected my wiFi on to a computer, so it can see available networks (just like a usb wireless adapter, you see these days - except using a phone) but still very much connected to a USB. So I'm not sure what the difference between this and USB/WiFi tethering, but I'd imagine it would be faster.

Edit: I actually want to be able to connect to a wiFi and see other available connections, using my phone and USB. This is to compensate for the fact that my computer doesn't support wiFi and hardware require for it. 

USB network adaptors are a very good example, of what I'm trying to want to do, except with a phone.
I have asked similar question. I couldn't get access to PC connected via USB (USB Tethering) from PC connected via WiFi (Mobile HotSpot). Solution was add routing for USB Tethering net on second PC.



$ sudo ip route add 192.168.42.0/24 via 192.168.43.224 dev wlp5s0


Here 192.168.42.0/24 is USB Tethering net, 192.168.43.224 is IP of Mobile HotSpot, wlp5s0 is WiFi interface of PC (Linux). (In my question I had two Android devices, so maybe this step is optional, I haven't checked).

Second, you should flush all the chains in ip table on Android device, e.g through Android Terminal Emulator. Assumed that device is rooted:



$ su
# iptables -F