Interesting
Are you kidding me? buddy
You should take a look at "Grammar in use-advanced, U39", it's about "should in that clauses; the present subjunctive
The primary structure is started with "should" and as you may know, in formal contexts, particularly in written English, you can often leave out "should" and use only the base form of the verb. This form is the present subjunctive. You can also find the negative and passive forms in the U39. Honestly, I preferred to keep "should" in the sentence in order that you wouldn't be confused. Actually, you surprised me with knowing well, but not completely about the subjunctive.
Besides, the trouble definitely needs a singular verb. But, as you may know "the troubles" needs a plural verb and after that you should complete the sentence with two or more than two noun phrases. Therefore, the issue is not using singular or plural verb. Unfortunately, I was in a hurry and missed out the "s" at the end of the trouble.
About "Sarah, cannot refer to my older sister's", you should turn it into the passive form. As you said, I advise you to read more carefully
Teaching you aside, I strongly agree with you about my sister's friend, Jean. In this case, you are right. But about "my sister's exp, Sarah" I severely disapprove of you. You aren't thinking about the issue as a native speaker, again
I wholeheartedly recommend you not to persist on your idea
By the way, don't take it personal
You'd better attempt to help people and I'll encourage you in this way
Best regards
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