Law Court terminology: "to sue" - "to convict" - "to file" : What's the difference? Thank you ss2010... but I have another doubt now... what's the difference bewteen "to convict" and "to sentence"

Is it correct if I say "I have received an invoice of $100 on what I had to pay $20 of tax?"

What difference between "precision" and "accuracy"?

What difference between "altitude" and "elevation"?

What difference between "value" and "worth"?

What difference between "problem" and "issue"?

Can somebody tell me what "chase this up" means?

What "one-off" means (i.e.: as in "you can make a one-off payment of $1.99")

Introducing myself Hi there! I'm 43yo and I live in Milan, Italy. I’m looking for someone who can help me to improve my language skills. Please feel free to contact me if you’re interested in learning Italian. Having a job that requires strong communication skills, I'm able to transmit a very advanced Italian. I’m also interested to learn more about people and cultures worldwide, so if you’re a writing-addicted or if you're just looking for an Italian friend, pls contact me. I look forward to hearing from you soon.