have been to的用法和注意事项

have
been
to
去哪现在已经回来
have
gone
to
去哪现在还没回来。
都用在现在完成时态当中。
例如：
I
have
been
to
Dalian
four
times
我去大连四次了（说明现在已回来）
He
has
gone
to
Dalian
,
he
will
be
back
in
two
days.
他已经去大连了，两天后回来。（去还没有回来）