My shoelaces came undone.

The first thing he did was to untie his shoelaces and take his shoes off.

The shoelace came untied.

Your shoes are untied.

Tom can't tie his shoelaces by himself.

Tom can't tie his shoes.

Tom doesn't know how to tie his shoelaces.

Wait a second. My shoe is untied.

Tom can't tie his own shoes yet.

Tom bent over to tie his shoe.

He bent down to tie his shoe.

Tom bent down to tie his shoe.

Do you know how to tie your shoes?