The snow clumped together to form a large snowball.

I am compiling my daily memories.

My bicycle is broken, so I need to mend it.

He is working on the revision of the thesis.

He stayed up all night to revise his thesis.

We are tallying up the monthly sales.

He is good at retouching photos.

This dress needs alteration.

He is the leader of that group.

They were prepared for the enemy's counterattack.