- This/that/it is the first/second/third/fourth/etc
This/that/it is the only . . .
This/that/it is the best/worst/finest/most interesting/etc
- This is the first time (that) I’ve heard her sing.
That’s the third time you’ve asked me that question.
It’s one of the most interesting books I’ve ever read.
- It was the third time he had been in love that year.
(NOT . . . ihe third time he was . . .)