既然相当于情态动词的词组“used to”中的“used”是实义动词，为啥该词组的否定式是“usedn't to do”

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I like cherry blossoms（樱花也可www.rixia.cc写作sakura）best.They have vairous kinds of colours. Some are white, some are pink,others are red.The cherry blossoms come out in early in
Japan.They are really beautiful.We can't live out flowers and plants.

first,there
a
stem
,as
the
stem
grows
,
it
makes
leaves
,do
you
remewww.rixia.ccmber
why
a
plant
has
leaves,the
piant
makes
food
for
itself
with
its
leaves
.
这是植http://www.rixia.cc物生长需要，不好意思帮不上什么忙。

Plants are important for us people. Do you know how to make plants grow better?
First, plants need sunlight to grow. So you'd better put them in 日夏养花网the sunlight.
Second, plants日夏养花网 need water to grow. So it's better for you to water them every day.
If you take good care of your plants, they can grow better and better. They can clean the air around us.

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