日本語 Japanese Ask Questions Thread 4

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.


Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

Japanese Ask Questions Thread3
http://dis.4chan.org/read/lang/1267485093/1-40

The way I learnt the Hiragana and Katakana, hu can also be used as fu, especially in the transcription
I'm no native speaker,in fact I'm still a beginner, but this one guy on a board told me that that's wrong, though he wouldn't give me an example.
Help me please? Is this correct or should I take account of some sort of diphtong?