Understanding particles

[Jawarrior1]

In ほんとう に ちいさい です (hontou ni chiisai desu) I am having trouble understanding
what the に (ni) particle has to do with either ほんとう (Chiisai) or ほんとう (Hontou).
Can anyone explain to me what the ni is for? Any help is appreciated.

そして (Soshite),

I have gone through some Pimsleur lessons and made some notes on particles
I have learned.

WA= SUBJECT MARKER, also for descriptions/COMPARISON
GA= Can do?.!, Want to do?.! (EXCEPT GATTE) IS THERE?.! It is (exception of de)?.! NEED?.!
O=TO/WILL DO?.!, IN HAVING(in asking aswell)?.! USED WITH GATTE
MO=ALSO, AS WELL AS
NO=TO TAKE POSSESSION OF
KA= QUESTIONS
NI= AT(TIME), IS(LOCATION, Asoko ni imasu), FOR(person/thing) add wa for comparison.
DE=HERE(LOCATION), IN ("DORU DE ") Add "wa" for it is (doru de wa takasugimasu)
TO= WITH
NE= ISN'T IT?

If anyone would tell me why the wa, ga and o can't work in some sentences I would appreciate it.
Pimsleur has not gone into much detail about that.

どうも ありがとう ございます

 

[undrentide]

本当に（ほんとうに） should be regarded as one word, meaning "really".

As for particles, I'd like to suggest to visit the following websites to get the basic ideas.

Wikipedia: Japanese grammar / Particle
Japanese grammar - Wikipedia
Japanese Partiles
Japanese particles - Wikipedia
Tae Kim's Japanese guide to Japanese grammar
Learn Japanese | Tae Kim's Guide to Learning Japanese
check out the following
Introduction to Particles （は、も、が）
Particles used with verbs （を、に、へ、で）
Noun-related Particles （と、や、とか、の）
also
Using Adverbs and Gobi

 

[Jawarrior1]

Nice! I love these sites! But When I looked for Ni i didn't find anything that applied to my
sentence, can some one go hd for just that one. Im gonna replace my notes with that wiki stuff its great!

= )

 

[Toritoribe]

Uh, as undrentide-san mentioned, 本当に is considered as one word, an adverb. に in 本当に wouldn't be the case particle.