unit10
have great fun doing sth
help sb (to) do sth
make sb do sth
find sb doing sth
decide to do sth
unit 11
don't mind doing sth
can't stand doing sth
enjoy doing sth
what about doing sth
thanks for doing sth
show sb sth=show sth to sb
unit12
practice doing sth
have to do sth
can do sth