Belong is a verb and this is how you use it

In the name of Allah, the Most Gracious, the Most Merciful,

Belong is a verb which is used to indicate possession or belonging to someone or something.

For example, you have a pen. You say: That pen belongs to me.

Just to be clear, it's wrong to say: That pen is belong to me.

Please, I plead you, don't do that.

Allah knows best.

Deadline

In the name of Allah, the Most Gracious, the Most Merciful,

Deadline refers to a particular time or date which something should be completed. [1]

Example: "The deadline is tomorrow and you are telling me this now?"

It is not to be confused with dateline, which is a line of text, usually at the beginning of an article or a news report, which shows the date and origin of an article.

Allah knows best.

[1] Taken from definition of deadline from Oxford Dictionaries Online.