in
front
of和behind主要用来指空间上的方位。
比如:the
river
is
in
front
of
his
house.
(河在他的房子的前面)
an
oak
tree
is
behind
her
garden.(一棵橡树在她的花园后面)
但是before和after却主要用来指时间上的前后.
比如:i
came
into
the
office
before
him.
(我在他之前来的办公室)
she
arrived
here
just
several
minutes
after
me.
(她是在我之后几分钟到这里的)
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