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.

you can't find
Marshmallow Peeps after Easter.
The Big Bang Theory Season 10, Episode 12

when he saw
Marshmallow Peeps after Easter.
The Big Bang Theory Season 10, Episode 12

SHELDON:
That\'s it. Prepare for marshmallow death.
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SHELDON:
That\'s it. Prepare for marshmallow death.
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SHELDON:
That's it. Prepare for MARSHMALLOW death.
The Big Bang Theory Season 4, Episode 4