Die Wortstellung

Word order

The neutral order is subject, verb, object — Ганна чытае кнігу — but it is a starting point rather than a rule. Because the case endings mark who is doing what, moving the words around does not change who did it:

• Ганна чытае кнігу. — neutral.
• Кнігу чытае Ганна. — it is a book she is reading, and it is Anna reading it.
• Ганна кнігу чытае. — she is reading it, not writing it.

In all three, кнігу is accusative and can only be the object. English cannot do this: the book reads Anna is a different sentence, because English uses position where Belarusian uses endings.

New information goes last

The reliable principle is that what the listener already knows comes first and what is new comes at the end. Answering Дзе Ганна? you say Ганна ў бібліятэцы; answering Хто ў бібліятэцы? you say У бібліятэцы Ганна. Same words, different question answered.

Leaving the pronoun out

The academic syntax describes a sentence type in which the personal form of the verb already identifies the subject, so a separate nominative is unnecessary. That is the everyday reason Іду на працу and Чытаю кнігу are complete Belarusian sentences: the -у can only be first person. Adding я every time is not wrong, but it reads as insistence — I am going, whatever anyone else does.

Things that do keep their place

• Adjectives stand before their noun: стары горад, not горад стары (which would be a statement, "the town is old").
• Prepositions stand before their noun, always.
• The particle ці opens the question it marks.
• Не stands immediately before what it negates.

If your first language is English

This is the topic where English habits do the most damage in the least visible way. Every English sentence you translate word for word will be grammatical Belarusian and will also be emphatically flat, because you will have put the new information in the middle. Read your sentence and ask what it is answering; put that at the end.