In a PhD dissertation, can one copy the structure of the acknowledgment section from their own or from someone else's prior work? In the acknowledge of a thesis, we thank all the people who helped our research. E.g.

"First of all I thank xxx, for xxx throughout my Ph.D. period."

For my master thesis's acknowledge, I tried very hard to rephrase the sentences to avoid repeating others' similar ones.

This time, I need to write my PhD thesis's acknowledge. I have download around 10 copies of other's acknowledges. I find it really difficult to work out a sentence structure that is different from all of them.

I mean the peoples we thank are different, but the reasons or the phrases representing how we should thank them are similar among all thesis.

I just wonder if I can stop struggling with rephrasing the sentence structure, and copy &amp; mix the sentences from my and others' acknowledges and just replace the people's names?

Is this an acceptable behaviors? Is this plagiarism or self-plagiarism?

I just think there are so many theses with acknowledges. You probably would never be able to work out an unique sentence structure. You will be similar to others anyway. So why not just copy, mix and change names?
First, throw away everyone else's acknowledgements sections. Ignore them.

Second, think of all the people to whom you feel grateful, and write down your thanks in whatever way feels natural to you.

It really is that easy. There's only so many ways to say something, so if it sounds similar to someone else's, so what? As long as they are your own heartfelt words, no one will notice or care.