1. We must respect our parents and teachers.
What’s the synonym of respect? Cherish or pertain?
It also means you highly regard someone.
In the context you want it to be used, it means you have to highly regard your teachers or parents.
Synonyms of regard are consideration, honour, value, etc.
Neither.
'Cherish' means 'adore'.
'Pertain' is completely unconnected in meaning. (Time for you to get a better dictionary, I think)
The closest synonyms of 'respect' in this context are probably 'honour' or 'revere'.
Synonyms (syno = similar/same nym = word) in every language, are critical to vocabulary development.
Here is a link to a great online Thesaurus:
Note that 'respect' is a verb in this context. If you are looking for a synonym to put in this sentence, you will need a word which is also a verb.