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.

But the Imp is half my SIZE.
Game of Thrones Season 1, Episode 6

No, after my tongue has swollen
to the SIZE of a brisket.
The Big Bang Theory Season 1, Episode 16

It was the SIZE of an apple.
Game of Thrones Season 3, Episode 7

You used Quicken to manage books
for a business this SIZE.
Breaking Bad Season 4, Episode 9

No, I am definitely
up a cup SIZE.
The Big Bang Theory Season 7, Episode 2