Translation:Hij spreekt Engels.
Why not He spreekt? I thought he and hij were both correct in many situations.
No, there is no unmarked form of "hij".
There's only zij/ze, jij/je and wij/we for the subject pronouns.
Praat is also accepted. Is spreek more common or appropriate? What's the difference?
From my knowledge in Swedish, I'm guessing Praat means talk, while Spreek is speak.
Swedish Pratar-To talk
When should I use spreek and when should I use spreekt? Is spreek singular and spreekt plural?
For first person singular you use spreek. Second and third person singular have spreekt. For plural this verb conjugates to spreken: wij spreken - jullie spreken - zij spreken.
You also use 'spreek' for second person singular only when the sentence is a question. So 'jij spreekt Nederlands', but in a question it becomes 'spreek jij Nederlands?'