Monodevelop not working properly..

Monodevelop doesn’t auto complete or predict any keyword or anything within the UnityEngine namespace, for example, it can complete any C# keyword like string, int, etc. but it can’t complete keywords like Mathf, Vector3 and so on, so please help me with this

You can try Visual Studio (free).

Make sure you’re opening the C# scripts from INSIDE unity.

The reason I’m using Mono right now is that Visual studio 13 was crushing on start up, so I had to uninstall it and download Mono as a replacement.