Question

have sth. but to do sth. have sth. but do sth. 以上

have sth. but to do sth.
have sth. but do sth.
以上哪个正确
遵循什么规则

Answer 1

have sth. but do sth.是正确的。因为这里but是一个连词，连词所连接的成分的形式是一致的。因此have sth to do 与but后面的句型保持一致，后面也用to do 的形式。