解：
1、my
sisiter
can
sing
the
english
song
now.
改为my
sister(is)(able)(to)sing
the
english
song
now.
2、please
tell
him
to
remember
to
clean
the
computer
room.
改为please
tell
him(not)(to)(forget)to
clean
the
computer
room.
3、he
was
so
excited
that
he
couldn't
say
a
word.
改为he
was(too)excited(to)(say)a
word.
4、dick
could
play
the
piano
when
he
was
eight
years
old.
改为dick
could
play
the
piano(at)(the)(age)(of)eight.
5、we
feed
sheep
on
grass.
改为we(feed)grass(for)sheep.
满意老师的回答敬请采纳，谢谢
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