You would also use formal English in compositions and essays that you write in school.

你也会在写学校的作文和论文时使用正式的英语。

youdao

I really like informal English, it's more casual than formal English.

我真的很喜欢非正式英语，和正式英语比较起来轻松休闲的多了。

youdao

Thankfully we have formal English or I wouldn't understand what you were saying.

幸亏我们有正式英语，否则我真的不可能明白你在说什么。

youdao

She says her students over the past several years have increasingly used less formal English in their writing.

VOA: special.2010.01.28

Johnson says that her students, over the past several years, have increasingly used a more informal English vocabulary in formal assignments.

VOA: standard.2010.01.16

For a manager, relying on formal English can create distance.

WSJ: Mastering the Finer Points of American Slang

Because Cox favors techniques and plantings gleaned from many epochs, cultures and movements, he has a bigger, more flexible design vocabulary than garden designers known specifically for their modernist, French-formal or romantic English leanings Cox likes it all.

WSJ: The Most Important Garden Designer You've Never Heard Of

His formal education was at an English private school and Oxford, and he became a radical while working as a student among London's poor, picking hops in Kent.

ECONOMIST: Trevor Huddleston