Sabahleyin derhal seni arayacağım.
- I'll call you first thing in the morning.
Sabah derhal orada olacağım.
- I'll be there the first thing in the morning.
Sabah hemen orada olacağım.
- I'll be there the first thing in the morning.
I would help you, but I don't know the first thing about gardening.
I'll meet you first thing at the station.
... First thing, we transform the big data into some model ...
... And then like what's the first thing that you do? ...