Structure
Verb + 必要 + が + ある
Details
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Standard
About ひつようがある
Like が必要, 必要がある is an expression which is used to highlight the 'need' or 'necessity' of something. The primary difference being that 必要がある highlights the need to 'do (A)', and will therefore be used with verbs (without the need for nominalization).
To use 必要がある, just attach it after the plain form of the verb that you want to highlight the 'need' for.
As we can see, this construction is simply the combination of a verb + 必要 (creating a verb modified noun), the case marking particle が, and the う-Verb ある. In this way, it just means 'the need of doing (A) exists'.
Naturally, this grammar pattern may also be used negatively, to highlight that there is 'no need to do (A)', or that 'doing (A) is not necessary'.
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Examples
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朝ご飯を食べる必要がある。
It is necessary to eat breakfast.
それを明日までに終える必要がある。
It is necessary to finish that by tomorrow.
この板が厚すぎて、切る必要がある。
This board is too thick, so it is necessary that it is cut.
痩せたいなら、運動する必要がある。
If you want to lose weight, then it is necessary to exercise.
ホテルに泊まるならカミソリを持って行く必要がある。
If you are going to stay at a hotel, it is necessary to bring a razor.
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