1.“so…that”结构表示“如此……以致”，so后跟形容词或副词，that后引出结果状语从句。例如：
I
was
so
busy
at
that
time
that
I
didn't
go
to
sleep
for
three
days.那时我很忙，一连三天都没睡觉。
The
noise
was
so
loud
outside
that
I
could
sleep
no
longer.外面的噪声这样大，我再也睡不着觉了。
The
pop
star
sang
so
beautifully
that
he
was
asked
to
sing
again
and
again.
歌星唱得这样好，人们要求他唱了一首又一首。
The
weather
is
so
cold
that
they
had
to
stay
at
home.天气如此冷，以至于他们不得不呆在家里。
The
coat
is
so
expensive
that
I
don't
want
to
buy
it.这件外套太贵，我不想买。
He
was
so
sad
that
he
began
to
cry.
他悲伤得哭了起来。
2.too…to…是英语中常用的一种结构。其句型为“too＋形容词或副词＋to
do…”译为“太……而不能……”，它在形式上是肯定的，但在意义上是否定的。这一结构的具体用法如下：
1)
“too…to…”本身已含有否定意思，因此，不定式前一般不加not。例如：
她太小了，还不能去上学。
She
is
too
young
not
to
go
to
school．
(×)
She
is
too
young
to
go
to
school．
(√)
2)
在too…to…结构中，若要指出动词不定式的逻辑主语时，则用too…for
sb．
to
do
形式。例如：
The
box
is
too
heavy
for
her
to
carry．
这个箱子太重，她抬不动。
This
question
is
too
hard
for
me
to
work
out．
这道题太难了，我算不出来。
3)
在too…to…结构中，如too前面有not,
never,
only等词时，此结构表示肯定意思。例如：
One
is
never
too
old
to
learn．活到老，学到老。
4)
若too后接ready,pleased,
glad等形容词时，too相当于very,
“too…to…”则表达肯定的意思。例如：
I＇m
too
glad
to
help
you．
我很乐意帮助你。
I＇m
too
pleased
to
see
you．
见到你太高兴了。
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希望可以帮到你哦！望采纳
谢谢！O(∩_∩)O