句子开头,什么时候用原形,ING形式,加TO?有什么区别
1.动词+ing通常叫做动名词，就是本身是动词加了ing以后就是一个名词了，放于句首一般作为句子的主语，如：Teachingis
a
meaningful
job,teach本来是动词“教育、教学”，teaching就是名词的“教育、教学”了。再如：Playing
basketball
is
good
for
our
health,打篮球有利于我们身体健康。（另外，动名词作主语放于句首时，谓语动词不管什么时候一定要用单数，这是考试中的重要考点，如上两句中的谓语都是“is”）
2.to+动词放于句首时表示目的，如：To
learn
English
well
,you
must
study
hard,为了学好英语，你必须努力
。表示的是目的，为了……。（另外，to+动词
实质上是动词短语
“in
order
to
+动词”的省略，例句也亦为：In
order
to
learn
English
well
,you
must
study
hard.）
明白了吗？
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