Rewrite the verbs in their -ing form.

to rebel – rebelling, to try – trying, to slice – slicing, to knit – knitting, to sew – sewing, to tie – tying, to travel – travelling, to open – opening, to lay – laying, to choose – choosing, to snorkel – snorkelling, to study – studying, to hang – hanging, to stay – staying, to drive – driving, to lie – lying, to tip – tipping, to fix – fixing, to sail – sailing, to take – taking, to see – seeing, to die – dying, to write – writing, to sit – sitting.