I am concerned about the results of today’s test. “Today’s test” means you are talking about a specific test. And remember, there is a big difference between “result” and “results”. “Result” is a consequence, often followed by a particular action. “Results” is a cumulative mark that one receives.
I am involved in the volunteer.
I am involved in the volunteer group/club.
Let’s reduce trash in this school.
Grammatically correct. In this case, you are like an inspector. There are several schools and you check each of them, and then decide “Let’s reduce trash in this school.” If you want to talk about your school, say “Let’s reduce trash in our/my school.”
自分が通う学校について言うならthis schoolよりour/my schoolの方が適切。
My mother forced me to study hard.
I never forced you to do that because I do know you don’t listen to me. It’s a waste of time, isn’t it?
His ambition knows no limits.
His ambition has no limits. Both OK.
I’ve born this pain for a long time.
You want to say “I have been bearing with this pain”? I would say the previous sentence or “I have put up with this pain/have been putting up with this pain”.
作った文だと、何か痛みを持って生まれてきたような印象を受ける。“I have been bearing with this pain”の方がよい。 put up withは「我慢する」のイディオム
I avoided going to hospital.
Good. NEVER SAY “AVOID TO ~”
He will realize that importance to study hard.
When you use that-clause, it should be a sentence, which means it has to be “S V ~” structure. “He will realize that it is important to study hard” is correct. Or you could say “He will realize the importance of studying hard.” In this sentence, “the importance of studying hard” is an object.
I depended on my mother when I was a child. And YOU ARE STILL DEPENDING ON ME.
“Rely on” also has the same meaning.
I demanded that he go park.
Almost! Close! I guess you remember my advice about “suggest” →“Suggest” is also used like this ; “I suggest that you should stay home”. It is often used with that-clause and “should” is often taken out, especially in American English. But even if “should” is taken out, you still have to use the dictionary form of the verb.
Ex ; I suggest that it be put off (postponed)./I suggest that he stay home.