动词之后接一系列动词不定式,除第一个不定式用to外,后面的不定式通常都不用to.那么这个应该怎么理解

"to talk and to do things with"是作friends的宾补,而to talk 和 to do things 并列 与with搭配.即to talk with and to do things with.
"除第一个不定式用to外,后面的不定式通常都不用to"一般是在to 后接的 词是做相同的成份时,第一个to 后的to 一般可省略,如,It is nice to have fridends and teachers.；it's nice to sing and dance.