情态动词+have done是虚拟语气吗？

这个不一定是的。它可以有两种情况的。
情态动词+have
done:第一，表推测;第二，表虚拟。
1.edn't
/shouldn't
+have
done
表对过去的推测，译为“本不需要、本不应该做....”
2.can't
have
done
表对现在的推测。译为“不可能....”
3.mustn't
have
done
表对过去的推测。译为“一定不会...”
4.couldn't
have
done
表推测是和2一样。它也可表虚拟，译为“本不可能...”
嘿嘿，我们老师今天上午刚讲的，应该没错。你也可以再咨询一下你们的老师。

对过去的事实进行推测：结构：情态动词+have
done
/
been+名词/形容词/介词短语
例句：
1.
Mrs.
Longmans
must
have
been
a
pretty
girl
in
her
youth.
2.
He
couldn’t
have
seen
Anna
yesterday.
She’s
gone
abroad.
3.
I
think
I
must
have
left
my
glasses
in
the
library.
4.
He
might
have
overslept
again.
5.
Where
can
Tom
have
gone
?
情态动词表达虚拟语气：表达“本来…”，“不然早就…”。这是情态动词的一种虚拟语气用法。表示说话人所讲的与所发生的事实相反。表达了说话人的埋怨，后悔的语气。其结构是在一些情态动词后面加
have
done
结构。根据要表达的意思，有如下结构：
should
have
done
/
ought
to
have
done：本应该……
shouldn’t
have
done
/
oughtn’t
to
have
done：本不该……
could
have
done：本来可以……
needn’t
have
done：本来没必要……
would
like
to
have
done：本来很想……
would
rather
not
have
done:
本来不愿意……
could
/
might
/
have
done:
不然早就……
例句：
1.
You
shouldn’t
have
laughed
at
his
mistakes.
2.
You
could
have
told
us
earlier.
3.
I
ought
to
have
bought
that
dictionary
last
week.
4.
You
ought
not
to
have
spent
so
much
time
in
reading
novels.
5.
We
need
not
have
been
in
a
tearing
hurry
to
catch
the
train.
6.
They
would
like
to
have
seen
that
film
last
film.
7.
If
he
had
given
me
his
number,
I
could
have
telephoned
him.
8.
They
might
have
been
frozen
to
death
but
for
the
rescue
in
time.