It's necessary for you to go. ✬

Outside advice may be necessary. ✬

Salt is necessary for cooking. ✬

If God did not exist, it would be necessary to invent him. ✬

It's necessary to avoid stress. ✬

Fresh air is necessary to good health. ✬

Your help is necessary to our success. ✬

Food is necessary for life. ✬

If it's necessary to do so, I'll pay back my loan now. ✬

I'll come if necessary. ✬