hi! to answer your question...
iru is part of the present tense conjugation.. to make a verb sound like something is happening right now at the very moment, you would say naiteiru or naiteimasu (naiteiru is short form and less casual). "doushite naiteiruno?" why are you crying (now)?
other examples using iru: shiteiru (now doing something), tabeteiru (now eating something), nondeiru (now drinking something), omotteiru (now thinking about something)
next, "no" makes it kind of a question
next, shiteru is actually shiteiru. you do not hear the "i" in "iru" because it is said quickly. so aishiteru is really aishiteiru. shiteiru itself means you are doing something now, but when you see it in verbs like "to love" (aisuru), you are actually just changing the suru to the "te form," and adding iru, making it aiSHITEiru. thats how you conjugate verbs into present active tense. te form+iru. tabako wo suu--> tabako wo sutTEiru;
sushi wo taberu---> sushi wo tabeTEiru; sake wo nomu---> sake wo nonDEiru
next, shite itself is the imperative form of "to do," making it mean "do it!" (like a command). if you see it in a verb like suwaru (to sit) as suwatTE, it means "sit!" Tabete, eat! Hashite, run!
lastly, those verbs come from "to be separated from" and "to be found"
hope this helps!
dmz_evolution wrote:i have some question:
from a song lyric
1."Doushite naite iru no"
Doushite = why
naite = crying
then what is the meaning for "iru" & "no"?
2. what is "~shiteru"?
e.g aishiteru, koishiteru
3. what is "~shite"?
4. what is "hanarenakute" and "mitsukaranakute"?
arigatou gozaimasu