Frequency: The word is one of the 700 most common words in English.
1.
You use again to indicate that something happens a second time, or after it has already happened before.
He kissed her again...
Again there was a short silence...
I don't ever want to go through anything like that again.
ADV: ADV with v, ADV with cl
2.
You use again to indicate that something is now in a particular state or place that it used to be in.
He opened his attache-case, removed a folder, then closed it again...
I started to feel good about myself again.
ADV: ADV after v
3.
You can use again when you want to point out that there is a similarity between the subject that you are talking about now and a previous subject.
Again the pregnancy was very similar to my previous two...
ADV: ADV cl
4.
You can use again in expressions such as but again, then again, and there again when you want to introduce a remark which contrasts with or weakens something that you have just said.
It's easier to take a taxi. But then again you can't always get one...
ADV: ADV with cl
5.
You can add again to the end of your question when you are asking someone to tell you something that you have forgotten or that they have already told you. (SPOKEN)
Sorry, what's your name again?
ADV: cl ADV
6.
You use again in expressions such as half as much again when you are indicating how much greater one amount is than another amount that you have just mentioned or are about to mention.
A similar wine from France would cost you half as much again.
ADV: amount ADV
7.
You can use again and again or time and again to emphasize that something happens many times.
He would go over his work again and again until he felt he had it right...
= repeatedly
PHRASE: usu PHR after v [emphasis]
8.