动名词短语和不定式短语中的宾补问题
例如 A:many people like watching others play game.
B:many people like to watch others playing game.
（1）在A句中为什么用不定式play 而在B中却用playing
（2）假若把to watch 换成often
（3）动名词短语和不定式短语在句中若做其它成分可以吗.那短语里面的watching to watch会改变吗