Examples of using "клялся" in a sentence and their english translations:
Tom swore he was innocent.
He claimed that he had returned the book to the library.
You swore that you loved me.
He swore that he would no longer drink.
- Tom swore he hadn't seen Mary all day.
- Tom swore that he hadn't seen Mary all day.
He swore he had photographic memory, despite the fact he couldn't remember what he ate last night for dinner.
I've never heard anyone swear like Tom.