ask sb to do sth和ask sb doing sth

只有ask
sb
to
do
sth，后面那种用法是不存在的。

ask的详细用法如下：

及物动词
vt.
1.
问;询问[+wh-][O6][O1]
She
asked
him
his
name.
她问他叫什么。
He
asked
me
where
Tom
was.
他问我汤姆在何处。
2.
请求;要求[+to-v][O2][O1][+that]
He
asked
that
they
(should)
be
allowed
to
use
a
dictionary.
他要求准许他们用词典。
I
came
to
ask
you
a
favor.
我来是想请你帮我一个忙。
I
asked
her
to
get
in
touch
with
Henry
as
soon
as
possible.
我要求她尽快与亨利联系。
3.
索(价);要求得到[(+for/of)]
They
asked
too
much
of
her.
他们对她要求过高。
He
asked
twenty
dollars
for
it.
这件东西他要价二十元。
4.
邀请[O][O2]
We
have
asked
the
Conrads
to
come
for
dinner
on
Friday
evening.
我们已邀请康拉德一家在星期五晚上来吃饭。

不及物动词
vi.
1.
问;询问;问候[(+about)]
Tell
George
my
parents
ask
about
him.
转告乔治我父母问他好。
Why
do
you
ask?
你为何要问?
2.
要求;请求[(+for)]
She
asked
for
a
cup
of
tea.