healthy的比较级和最高级是什么，是不是有两种情况。

healthy:
[
helθi
]
a.
健康的
[
副词healthily
]
[
形容词比较级healthier
最高级healthiest
]
[
名词healthiness
]
例句与用法
1.
his
grandpa
is
healthy.
他的祖父身体健康。
2.
his
inmost
thoughts
are
not
healthy.
他心灵深处的思想是不健康的。
3.
a
healthy
shoot
should
form
a
strong
graft.
健康的嫩枝可以长成强壮的接穗。
4.
although
my
uncle
is
old,
he
looks
very
strong
and
healthy.
我的叔叔虽然老了，但他看上去还是很健壮。