поэ́тому vs зате́м

poetomu vs zatem — therefore/so vs then/afterward

What it really means

Поэ́тому means “therefore,” “so,” or “for that reason.” It links a cause to its consequence and often appears with a comma: шёл дождь, поэтому мы остались дома, “it was raining, so we stayed home.” It answers why a result follows from the preceding fact.

Зате́м means “then,” “afterward,” or “next,” marking order in time or in a sequence of actions. It does not itself say that the second event was caused by the first: сначала прочитайте инструкцию, затем включите прибор, “first read the instructions, then turn on the device.” Use поэтому for logic and затем for chronology.

Examples in natural speech

Я устал, поэтому рано лёг спать.
I was tired, so I went to bed early.
Дорога была закрыта, поэтому мы повернули назад.
The road was closed, so we turned back.
Сначала позвони мне, затем напиши письмо.
Call me first, then write a letter.
Он закончил работу и затем ушёл домой.
He finished work and then went home.
Поэтому я и пришёл.
That is why I came.

Common mistakes

Do not use затем when you mean “therefore”: it only orders events. Conversely, поэтому does not mean simple “later.” Also keep the stress and spelling of поэтому; it is not the same word as потому что, which introduces a reason rather than the result.

Memory tip

Поэтому gives the consequence; затем tells what happened next.

Frequently asked questions

Can поэтому begin a sentence?

Yes: Поэтому мы отменили поездку means “Therefore, we cancelled the trip.”

Is затем common in conversation?

It is neutral but somewhat bookish; потом is often more conversational for “then/later.”

How does поэтому differ from потому что?

Поэтому introduces the consequence, while потому что introduces the reason: Я ушёл, потому что устал; Я устал, поэтому ушёл.

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