1.
(Do
some
sports)
and
you
will
feel
better.
祈使句(do
sth.)
+
and
+
陈述句
2.
Do
some
sports
(to
be
healthier).
括号中动词不定式说明目的。
3.
doing
sth.
要么是动名词，要么是现在分词。
Watching
TV
sometimes
is
boring.
Seeing
from
the
top
of
the
tower,
we
find
our
city
so
beautiful.
4.
to
doing
sth.就是动名词作介词to的宾语。to在很多时候都加动词原形构成动词不定式，而在类似look
forward
to
这样的短语后面跟动词的时候就用
doing
.
比方说
I
am
looking
forward
to
meeting
you.
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