The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

I complain about what a BURDEN
it is at least once a month.
The Big Bang Theory Season 7, Episode 2

It's only a name.
Quite an easy BURDEN to bear.
Game of Thrones Season 5, Episode 3

You're not a BURDEN,
The Big Bang Theory Season 10, Episode 18

our friendship was
a BURDEN to you.
The Big Bang Theory Season 7, Episode 2

So you can imagine my BURDEN,
Game of Thrones Season 1, Episode 5