"should to"

I came across this sentence in an article which my friend tweeted:

“The survey was aimed at determining what things people think should to be subject to setsuden(electricity conservation).”

To my (very limited) grammatical knowledge, It is a verb that usually comes after auxiliary verbs, such as “should”. My question here is why we need “to” in this sentence. Actually, I have not seen so many example sentences which include this particular expression. I would be happy to get some answers from you.Thank you.

I think you may have come across a slight error. I have played with two variations:

The survey was aimed at determining what things people think should be subject to setsuden. (drop the ‘to’.)

The survey was aimed at determining what things should be subjected to setsuden. (drop the ‘people think’ and use ‘subjected to’.)

As I don’t know anything about setsuden, my second variation may not make much sense, but would be grammatically correct…

Dear SanneT,

What a quick reply! Yes, what you wrote above was exactly what I had thought it would be when I considered the meaning of the sentence.

As you said, the article may have included an error.

Thank you for your quick and detailed explanation as always!