Verb conjugation of "untie" in English

This is not so easy, my dear! Unless you have learned Latin, then Italian is not an easy language... I'm new here, I found the site through Google. How does it exactly work here? I want to sign up.
We can help each other with these language studies, this is also the main purpose of Vocabulix. I have already got in touch with some other users. I can speak Italian, but my grammar is weak.
First, let me thank you for your answer. And how can I support you further? I'd be very happy about it if we could both help in each other in learning Spanish. 'Tandem' learning beats all other methods.