I suggest/advise you eat a banana. 我建议你吃一根香蕉
You can eat a banana. 你可以吃一根香蕉
You had better eat a banana. 你最好吃一根香蕉
Why don't you eat a banana? 为什么不吃一根香蕉
Why not eating a banana? 为什么不吃一根香蕉