i am bored with yaoi nd shojo. pleaze recomend me sum great shounen seinen mangas 2 read. ...

How about this one http://www.mangago.zone/read-manga/majin_tantei_nougami_neuro/ a detective story

My faves:

http://www.mangago.zone/read-manga/ajin/
http://www.mangago.zone/read-manga/fullmetal_alchemist/
http://www.mangago.zone/read-manga/gintama/
http://www.mangago.zone/read-manga/onepunch_man/
http://www.mangago.zone/read-manga/tokyo_ghoul/
http://www.mangago.zone/read-manga/tokyo_ghoulre/

I also like Itou Junji's stuff: http://www.mangago.zone/r/l_search/?name=itou+junji

adderall's lists are really good too, so check them out: http://www.mangago.zone/home/mangalist/707/
http://www.mangago.zone/home/mangalist/26868/

you could check out my favorite non-BL list. Maybe you will find something to your taste there? (shoujo included - please ignore ╮(￣▽￣)╭ )
http://www.mangago.zone/home/mangalist/64150/?filter=&page=1

http://www.mangago.zone/read-manga/lookism/ - first 2 or 3 chapters are not so interesting but after that the story is really good

hmmm,,,maybe something like this
http://www.mangago.zone/read-manga/switch/
http://www.mangago.zone/read-manga/billion_dogs/
http://www.mangago.zone/read-manga/detective_academy_q/
http://www.mangago.zone/read-manga/000000_ultra_black/( it's dropped tho)
http://www.mangago.zone/read-manga/out_code/
http://www.mangago.zone/read-manga/qed/
http://www.mangago.zone/read-manga/shinrei_tantei_yakumo_akai_hitomi_wa_shitteiru/
http://www.mangago.zone/read-manga/shinjuku_dxd/
http://www.mangago.zone/read-manga/dolls/
http://www.mangago.zone/read-manga/enigme/
http://www.mangago.zone/read-manga/di_e_ce/
http://www.mangago.zone/read-manga/kuro_no_tantei/
do I need to add tantei conan and kendaichi series too (●'◡'●)ﾉ
btw sorry, there's still lots of them but cuz it's already night, my mind could only processing this much

Psyren
Jackals

http://www.mangago.zone/read-manga/ran_to_haiiro_no_sekai/
http://www.mangago.zone/read-manga/20th_century_boys/
http://www.mangago.zone/read-manga/kaijuu_no_kodomo/
http://www.mangago.zone/read-manga/vinland_saga/
http://www.mangago.zone/read-manga/beck/

why dont you try shokugeki no souma? youll enjoy it esp if you like to cook and to eat.

Vagabond
Rookies
Slam Dunk
Monster

i think you'd like this one
http://www.mangago.zone/read-manga/mushishi/
it's seinen and very unique (completed too)
The MC is kinda a supernatural detective/doctor/scientist (〜￣△￣)〜

( I just noticed that the summary says "a cross between a researcher/scholar/doctor/shaman" pffff xDDD you really can't simply pin it on just one (≧∀≦) )

of shonen, besides some of the already mentioned stuff, try Magi
http://www.mangago.zone/read-manga/magi/

and the breaker (it's simply awesome :OOOO )
http://www.mangago.zone/read-manga/the_breaker/

these are awesome too:

http://www.mangago.zone/read-manga/rurouni_kenshin/ a classic havetoread

http://www.mangago.zone/read-manga/hunter_x_hunter/

http://www.mangago.zone/read-manga/black_haze/

oh and i don't really have any detective ones, one of my least read genres ╮(￣▽￣)╭

and yes, these are some of the best shonen i read, forever my faves <3

http://www.mangago.zone/read-manga/gantz/
http://www.mangago.zone/read-manga/liar_game/
http://www.mangago.zone/read-manga/the_children_s_teacher_mr_kwon/
manga/tate_no_yuusha_no_nariagari/

http://www.mangago.zone/home/mangalist/35626/