~te + imasu / ~te + iru/ru
I was just wondering how to use a ~te form verb then added with "imasu" and ~te form verb added with "ru". Whats the difference and how to use it?

Question

Answer

te+imasu = polite (use it when you're talking to people you don't know or your boss, elderly people etc.
te+iru or ru = informal (use it when talking to your friends)

Answer

て+います　て+いる(る）はおなじいみです。
どちらも　present continuous tense　ですが
て+います　のほうがていねいないいかたです。