They are adverbs and strengthen the meaning of the sentences.
1, "zehi" expresses a request and a hope. So we usually use"zehi"
" zehi" "kitto" "kanarazu"
ZEHI | KITTO | KANARAZU | |
a hope | Kare ni zehi kite moraitai. Kare ni zehi kite hoshii. |
//////////////// | Kare ni kanarazu kite moraitai. Kare ni kanarazu kite hoshii. |
a request (a order) |
(contains feeling of wish) Zehi kite kudasai. ///////////////////// |
(contains feeling of expectation) Kitto kite kudasai ne. //////////////////////// |
(contains feeling of conviction) Kanarazu kite kudasai. Kanarazu kinasai. |
a determination |
////////////////// | Kitto ikimasu. | Kanarazu ikimasu. |
an inference | ////////////////// | ( subjective inference) Kare wa kitto kuru desyo. Kare wa kitto kuru hazuda. Kare wa kitto kuru ni chigainai. |
( objective inference Kare wa kanarazu kuru desyo. Kare wa kanarazu kuru hazuda. Kare ha kanarazu kuru ni chigainai. |
a conviction | /////////////////// | (subjective conviction) Kare wa kitto kuru. Kono kusuri o nomeba kitto naoru. Kare wa kitto dokushin yo. |
(objective conviction) Kare wa kanarazu kuru. Kono kusuri o nomeba kanarazu naoru. /////////////////////// |
a certain result (natures law habit...) |
//////////////////// | //////////////////// | Haru ni nareba kanarazu
hana ga saku. Kare wa asa kanarazu ha o migaku.(a habit) |