这个仅供参考，希望采纳，我自己写的
Dear
teacher，thank
you
for
your
help！With
your
help，my
grades
has
improved。My
parents
are
very
happy。I
used
to
like
playing
and
always
fail
tests。One
day
you
told
me
that
I
need
concentrate
more
on
my
studying。Since
that
day，I
became
much
more
interested
on
my
study。And
my
grades
get
better
and
better。In
a
word，thank
you
very
much！
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