Yes, it is an interjection, because it does not provide a clear command as would "go" or "stop."
It can be a signal to begin action.
Yes, "now" can be used as an interjection to express urgency or impatience. For example, "Now, let's get moving!"
Oh is an interjection. Example: "Oh! I have to go now."
its an interjection
No, it is not an interjection.
"The" is not an interjection.
Only when it is a interjection: So, you're ready now, are you?
it is an interjection
It is a interjection lol
"Ouch" is an interjection*, which sometimes now seems to be called an ejaculation. *I learned parts of speech in the 1950s.
interjection
Yes, "Help" is an interjection.
Yes, "ouch" is an interjection.
interjection