Puzzles - Could you tell why ? You want to become an detective ?

LOL.... aigno u seem 2 good for Mr. thangnn...... Maybe better puzzles are necessary here. I have a riddle for both of you.
What starts on red and stops on green?
Lung Tung Beng :::

Time never comes back. Thats why we should kill it before its gone.

so long to meet you again, these days, almost the time I was in front of an TV ( not only my home TV ). France and England made me so disappointed with their first matches .
And now, here is the answer for LungTungBeng : It's yellow !
Rite ?

Thank u thangnn for your reply. Nice try and interesting idea, but wrong. If you were referring to the yellow traffic light then actually yellow starts from green and ends at red, not vice versa.
PS. Spain and Brazil wasn't any better, eh??
Lung Tung Beng :::

Time never comes back. Thats why we should kill it before its gone.

Hi LungTungBeng,
It's my turn. Let me guess ... I think ... If you question means what starts on red and what stops on green then my answer is the letters R and G.
Chắc là sai rồi

Hihi.... sai là cái chắc rùi.... This refers to only one thing, not two. But aigno, thanks for trying anyway.
If this is a little hard, then I'll give you a big hint: it is related to something we usually do on Tết (New Year holidays). Get it ?
Lung Tung Beng :::

Time never comes back. Thats why we should kill it before its gone.

Hi LungTungBeng,
Thanks for your hint. So I will try to answer your question again.
What starts on red and stops on green ?
That happens when you're eating watermelon.
is it rite ?

Applause!!! You got the correct answer aigno!
Now please continue with your riddles, I'm ready for the fun.
Lung Tung Beng
Đừng làm hôm nay những gì có thể dời lại ngày mai.

cool puzzle , LungTungBeng !!!
I've found an interesting one :
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After a local bungled heist, five suspects were being interviewed by the police. Eventually the police managed to get a confession. Below is a summary of their statements and it turns out that exactly 5 of these statements were true. Would you make a good detective, try and work out who committed the crime?
+ Adrian said:
It wasn't Barry
It was Cedric
+ Barry said:
It wasn't Adrian
It was Derek
+ Cedric said:
It wasn't Derek
It wasn't Barry
+ Derek said:
It wasn't Eric
It was Adrian
+ Eric said:
It wasn't Cedric
It was Derek
-----------------------------------

Thanks thangnn for your riddle. This can be solved by my favorite method to solve this kind of puzzle, by blind guess (đoán mò). At first I assume that it was Adrian, then figure out how many statements would have been true. Next come the others, so on. And I came to the answer: it was ERIC who committed the crime. Rite??
Now I have for you another very simple riddle, see if you can solve it:
Those that can't use it can never part with it. Those that can use it, part with it. What is it?
Lung Tung Beng
Đừng làm hôm nay những gì có thể dời lại ngày mai.

Surrender , I just can make guess, maybe it's an kind of tool !!! aiggno , where are you ???