~必要がある (need to)

The world needs to come together as one and tackle the climate change issue.

She needs to help him out.

We need to think about what to do and carry out the research economically and efficiently.

Once the articles of incorporation are complete, you need to go to the notary office to have them authenticated.

The train arrived on time, so we didn't have to wait at all.

She needs to be more careful.