Can I say 'afterward' instead of 'afterwards (with an -s at the end) in the given sentence?
Leo cleaned the dining room. Afterward, Martha swept the yard.
I have never seen it used without the 's' in regular British English; a quick bit of research shows that it is used without the 's' in the US though, so I guess the two are interchangeable. Whatever you choose, stick to the same style throughout and, if you're writing using the conventions of the US / UK, bear in mind which is commoner in each place.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
I have never seen it used without the 's' in regular British English; a quick bit of research shows that it is used without the 's' in the US though, so I guess the two are interchangeable. Whatever you choose, stick to the same style throughout and, if you're writing using the conventions of the US / UK, bear in mind which is commoner in each place.
I'd say "afterwards" is usual here, too. It doesn't seem as clear-cut as toward/towards.