Question

英文改为否定句和肯定句怎么改

Answer 1

在系动词be、助动词be，have
／has
／had，will，shall，would，should和情态动词后加not（n't）。若句中没有这些词，则根据谓语动词的原形、第三人称动词形式或过去式而分别在其前面加do
not（don't），
does
not（doesn't）或did
not（didn't），并将第三人称动词或过去式改为原形。如：
He）用含否定意义的词（如：never，nothing，nobody，none，neither，
little，few等
will
write
t
①always
／ever→never，and→or。如：
He
was
always
late
for
school
last
term．→He
was
never
late
for
school
last
term．
they
have
ever
read
the
book．→They
have
never
read
the
book．
He
can
speak
Chinese
and
English．→He
can't
speak
Chinese
or
English．
②too→not．．．either，already→not．．．yet。如：
He
goes
to
school
by
bike，too．→He
doesn't
go
to
school
by
bike，
either．
He
has
already
finished
the
work．→He
hasn't
finished
the
work
yet．
③all→none，both→neither，both．．．and→neither．．．nor，此时，谓语动词仍用肯定形式，但当neither作主语，谓语动词用单数形式；neither．．．nor．．．连接两个主语时，谓语动词应和nor后面的主语保持一致。如：
He
knows
all
of
the
workers
here．→He
knows
none
of
the
workers
here．
Both
of
the
twins
are
from
England．→Neither
of
the
twins
is
from
England．
Both
Emma
and
John
have
gone
to
Tokyo．→Neither
Emma
nor
John
has
gone
to
Tokyo．
3）当think，believe，suppose等动词后面跟宾语从句时，通常用否定主句谓语动词来达到否定从句谓语动词的目的。如：
I
think
they
can
come
tonight．→I
don't
think
they
can
come
tonight．
4）当must表示推测，表示“一定、肯定”的含义时，否定句应用
can't。如：
He
must
be
in
the
room．→He
can't
be
in
the
room．
he
book
in
two
months．→He
won't
write
the
book
in
two
months

Answer 2

否定句一般都加not.双重否定为肯定句。就像你举例的，否定时单数加doesn't复数加don't.肯定句时去掉它们

Answer 3

这个句子是一个否定句，要将其转变为肯定句除了要将助动词
doesn't
去掉之外，还应注意它的主语是第三人称单数，所以动词也应有相应的变化,
应改为my
father
likes
playing
tennis
.