Lesson on "to need"??

[japanfesgirlie]

Sorry, I don't know where else to put this topic, but is there a lesson on how to say "to need" as in, to need to do something, or to need something in general? I just really need to know. Thanks!

[hatch_jp]

to need = 必要(ひつよう)がある　[hitsuyou ga aru]
　　　or = なければならない [nakereba naranai]
　　　or = なければないけない [nakereba naranai]
　　　or = なくっちゃ [nakuttya]

For examples;
1. I need to go.
　行（い）く必要（ひつよう）がある[iku hitsuyou ga aru]
　行（い）かなくてはいけない[ikanakuteha ikenai]

2. I need to do my homework.
　宿題（しゅくだい）をしなければいけない。[syukudaiwo sinakerebaikenai]
　宿題（しゅくだい）しなくちゃ。[syukudai sinakutya]

3. I need to do something
　何（なに）かしなければいけない。[nanika shinakereba ikenai]
　何（なに）かしなくちゃ。[nanika shinakutya]