表达不确定的事情. Can we go to cinema this weekend? But you are not if you have time. Then you can say, "Not sure, it's still up in the air."

表达试一下. Say, "Give it a try." or just say "Try."
I'm going to try. I'm going to give it a try. But "I'm gonna have a try." gives people a feeling that somebody wants to do right now or immediately.

去别人家做客要洗碗吗?
After you visited friend's home. Do you guys think that we should wash the dishes before we leave someone's house? Is this an important thing to do or should be at least offer? So because your host has been busy cooking the dinner for you. There're loads of messy plates. Do you offer to help tidy up? or do you do the washing up? What should you do? What do you think? Write your ideas, let me knows down below.
"Offer" means somebody really wants to help.

表达自己很忙
How to express that you are busy? For example, "Can you do some extra work today?" "Sorry, I can't, I'm swamped."
"Can you come to dinner with your mother-in-law?" "Sorry, I'm totally snowed under at work."
"Can you work overtime?" "Sorry, I've got a lot on my plate right now."
"Can you finish my essay for me?" "Sorry, I'm buried in work."
"Can you look after my kids?" "Sorry, I'm up to my ears with work."