The Gerbil had ( forgot, forget, forgotten )
where its tail was.
I (were, was, am ) suffering last week,
but I have improved since then.
This morning I ( is, am, will ) be going to
work in a spaceship.
You ( will, would, have ) hear the result of
the competition next week.
( Write, Wrote, Writing ) clearly so people can
understand what you mean.