Questions about verbs

So, I've been studying japanese for a while and learned the basics ok.
Now I'm reading song lyrics and stuff and I can't understand the usage of some verb+iru or something like that form.

Let's see this.
踏まれて.
I know the verb 踏む, and I know it has something to do with いる here but I'm not pretty sure what happens here, and why.

Also ねじられ.
I also know the verb ねじる (捩る) but I guess it's something like the first example.

Can someone help me understand this kind of verb forms? Is it slang? Will I encounter something like that in formal writing,books or manga?

Thanks in advance!

The verb is 踏む, "to step on (something/someone)," 踏まれる is its passive, "to be stepped on (by someon), and　踏まれて is the "te-form" of that.

The verb is ねじる, "to twist," ねじられる is its passive, "to be twisted (by someone)," and ねじられ（て） is probably the te-form minus the "te," maybe the sentence continues on to another phrase?

I'm assuming you're unfamiliar with the te-form. You should read about it. To have te-form + iru means that action (i.e. the verb) is/was ongoing or ~ing.
見ている seeing
読んでいる reading
知っている know
食べている eating
For polite form, use imasu instead of iru. Past tense is ita or imashita.
E.g. ２５年間結婚をしていた。(I) was married for 25 years. Te-form is used because being married was a continuous state.

I suggest the use of textbooks rather than songs/manga/anime, because the latter use a lot of colloquial and casual language. Best you start with polite form.

Good luck!

The phrases mentioned by Fumichu do not contain any "-iru" expression. I thought he/she was having difficulty identifying the "passive" form of the verb :) Of course, te-form + iru is part of the basics, though.

@ AK: I'm just assuming that's the issue they're having given the original question in English, not the examples. Your explanation was, as always, excellent.

So, every verb has a passive form?
踏む, 踏まれる
見る, 見れる？
also, is the passive form of every verbs treated like a -ru verb?
Can you give me some example sentences?

***I just realized that in my previous comment should be 見られる。

There are passive forms of verbs in their "-masu" form as well.
I am listing:
verb in dictionary form, its passive, (verb in "masu" form, its passive).

踏む、踏まれる　（踏みます、踏まれます）
見る、見られる　（見ます、見られます）
食べる、食べられる　（食べます、食べられます）
聞く、聞かれる　（聞きます、聞かれます）

A ru verb? Do you mean ichidan verbs?

@chiffon
Yes thats what i meant.
The conjugation of the passive form is treated like an ichidan verb?
踏まれる　
踏まれた - past form
踏まれて - te form

Is this correct?

I am sorry that I learned it a long long time ago.
you are asking the usage(variation) of れる,られる.
original verb = 踏む
conjugation to = 踏まれる

踏まれない
踏まれて
踏まれる
踏まれるとき
踏まれれば
踏まれろ

下一段活用.

Thank you very much!