What is the conjugated form of tetsudau to say: I want to help (in Japanese)
I know that generally to say I want to (verb)~ would be (verb plain form)~ tai
but with tetsudau I'm an bit stuck... is it 手伝い? Google says 助けたい but I don't trust it...

Question

What is the conjugated form of tetsudau to say: I want to help (in Japanese)
I know that generally to say I want to (verb)~         would be (verb plain form)~ tai 
but with tetsudau I'm an bit stuck...  is it 手伝い? Google says 助けたい but I don't trust it...

Answer

i'm not japanese but i'll help with what i know.
when you add "tai" to a godan verb, you change the last letter from "u" sound to " i" sound.
examples:
手伝う~手伝いたい
書く~書きたい
飲む~飲みたい
but if the verb is ichidan, you just replace "ru" with "tai" without any changes to the verb.
examples:
食べる~食べたい
助ける~助けたい

Answer

@Ryokoさん、いつもありがとうございます＾＾　@WCalCasさん、どういたしまして！

Answer

My pleasure!

Answer

Thank you Flora san and Ryoko san for clarifying as well! ^^

Answer

Ame-san's answer is correct. "I want to help" = 手伝いたい(です) or たすけたい(です), basically we translate like these but it's possible seeing Flora-san's translation on the subtitles or something.