动词ing形式做主语时,谓语动词要用单数

是的.
Watching basketball games is very interesting.能解释一下吗谓语动词谓语动词就是在句子中充当谓语的动词问那些是谓语动词Memorizing the words of pop songs also helps a little .Have conversation with friends was not helpful allMemorizing the words of pop songs also helps a little .（helps)Having conversation with friends was not helpful all (was not)help 和was not 是动词吗？help后有个s，不应该是单数吗？动词加s或者es就是单数形式