according to the rules angļu valodā:

I told you do it by the book.

This official document must be written by the book.

I want that everything in this company was done by the book. Say goodbye to your unfair practices.

She feels she has to go by the book and can't use her creativity.

We have to do everything by the book.

we are regularly audited by several regulatory agencies. It's important that we do everything by the book.

There are a lot of audits in our industry, so it is important to do everything by the book.

The teacher insists on doing everything by the book, that's why i said I hate his way of teaching.

Matt insists on doing everything by the book. It's so annoying!

So. as I told you on the phone: she’s the leader and we do everything by the book.

He always does things by the book.

The school uniform is convenient because it can be worn for both informal and formal occasions.

They exchanged formal greetings.

Do we dress formal?

His language is very formal.

Her clothes were out of place at a formal party.

He was a tall, heavy-looking young man of five-and-twenty. His air was grave and stately, and his manners were very formal.

Boy, did she have egg on her face when she showed up at the formal party wearing blue jeans!

I will send our formal agreement to you.

She kept conversation on a formal plane.

Formal dress must be worn.

How formal is this ceremony?

Formal declarations of war haven't been America's style since 1942.

Some cultures and situations are formal, which means that we have to follow rules, other cultures and situations are more informal.

Gift-giving is quite formal in some countries.

Whenever I translate something from English into Spanish, I prefer to use the familiar "tú" instead of the formal "usted".