Hi, I'm an English learner and I learned that when using words like "up", "off", if the words after a verb are more than 2, then I should put "up" or "off" right after the verb.
But when using words like "it","him" for an object, then the word, for example,"up",
comes after the object.
ex) He pushed up a huge rock.(←"up" comes right after a verb)
He pushed it up. ("up" comes after a certain object)

However, this rule does not always fit.
A good example is "see off".
I ask you, who use English as a first language, that which is better to say.
1.) I saw her friend off at the airport.
2.) I saw off her friend at the airport.

Please state the number that you think is better with some reasons why you think so.
Thank you for reading this.