now and again

any time now

Very soon.

come again

A polite formula used when one has not heard or understood what has been said, or to indicate surprise.

here we go again

An expression of frustration upon seeing or hearing something bad repeated.

now and then

Synonym of occasionally, sometimes, intermittently.

now for

Used to introduce something that is to occur or be presented next.

now or never

At this sole opportunity or time, or not at all.

now you mention it

Used to precede another comment about something just mentioned.

now you're cooking

Used to praise someone for adopting a more effective or suitable method or approach, or to signal that progress is being made.