Having once landed the monster immediately jumped again and was over my head.

Once she starts talking, she is hard to stop.

She doesn't talk much, but once she does speak she is eloquent.

Once you go ahead and start, even the tiresome work of adding and subtracting figures is interesting in its way.

Once you begin, you must continue.

A bad habit, once formed, cannot easily be got rid of.

Once you've got into a bad habit, it can be difficult to get out of it.

You're always there for me, so if you're ever in dire straits, just let me know and I'll come running.

Once she starts talking, there is no stopping her.

Once you have made a promise, you should keep it.

Once you have made a promise, you must keep it.

Once we start reading a book, we should read it all the way through.

Once you have begun to do something, don't give up.

Once you break the seal, you can't return the tape.

Once you have reached informal agreement, you should enter into a contract with the other party.

Once she arrives, we can start.

You'll like him once you've had a chance to talk to him.

You cannot separate the milk from the coffee once you put it in.

Once you get to know her, she is very friendly.

He doesn't behave himself once he's drunk.