to做介词和做不定式标志的区别
to do 和to doing 的区别？实例最好
推荐回答（3个）
1）to + do（动词原形）为不定式，很常见，.如 want to do 等
2）to +doing 中的 to 为介词。例子：
1、look forward to doing
2、be used to doing(习惯于)
3、pay attention to doing
4、devote...to doing等
主要是在一些特定的短语中to 是跟在词组本身的一般为介词比如looking forward to doing
若是可以省to 或加doing 则为不定式比如like to do like doing .wish to do .start to do 一般来说介词用法少 可以记忆
如果这个带to 的短语后可以跟名词， 那么to就是介词。
to是介词， 要跟名词或doing的短语有 be/get used to习惯于 make a contribution to 为...做贡献 look forward to 期盼 hold on to 坚持
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