Some girls work hard, but the other girls don't.

Yes. That's exactly what othersmeans.

CJ

Thank you! May I ask another question?

In this sentence "Some habits are good, other habits are bad.", there's no conjunction between the two sentences. My grammar book says this is OK because "and in sentence like this can be left out".

Is what the book said is true? Thank you!

Hi,

"Some girls work hard, but the others don't." Can I rewrite this sentence as "Some girls work hard, but the other girls don't."?

You should decide if you want to speak generally about all girls, or about a specific group of girls. I would suggest

Some habits are good, other habits are bad is generally considered a "comma splice" - a fault in punctuation. It is usually recommended that a semi-colon be used instead of a comma in these cases.

Some habits are good; other habits are bad.

CJ

<< Is what the book said is true? Thank you! >>

CJ

Thank you, Clive and CalifJim. You've been a great help to me.