I have an experiment class every Tuesday. There are each of groups of three people. Anyway, we have to prepare two materials before on Tuesday. that's like assignments. I'm the oldest of my group. So, i lead my group. And i suggest them that we (should) do assignments at least before three or four days of the class. But rest members of my group didn't want to accept my thought. How come they didn't select my thought that was moderate for us? So, i really got angry and then yelled at them. We just started discussing something as i yelled. After all we were supposed to have my opinion. Actually, I felt like i was going to hit them because they're always a bit rude. Anyway, it was not bad to end so.

There are each of groups of three people.

-> There are three people each group.

Anyway, we have to prepare two materials before on Tuesday.

->  Anyway, we have to prepare two materials before  Tuesday.

And i suggest them that we (should) do assignments at least before three or four days of the class.

-> And I suggest them that we (should) do assignments at least before three or four days of the class.

that's like assignments.

-> That's like assignments.

I'm the oldest of my group.

-> I'm the oldest in my group.

So, i lead my group.

-> So, I lead my group.

So, i really got angry and then yelled at them.

-> So, I really got angry and then yelled at them.

We just started discussing something as i yelled.

-> We just started discussing something as I yelled.

After all we were supposed to have my opinion.

-> After all, we were supposed to have my opinion.

Actually, I felt like i was going to hit them because they're always a bit rude.

-> Actually, I felt like I was going to hit them because they're always a bit rude.