Are you suggesting (that) I'm lazy?
為什麼不是
Are you suggesting (that) I be lazy?
此處 suggest 意指「暗示」,你在暗示我很懶嗎?不是「建議」我應該如何如何。suggest 後面用原型動詞是因為省略了助動詞 should 如 They suggest that she (should) go immediately. 這一句中,你不可以說 Are you suggesting that I should be lazy?
本人讚同Ed的解說。
I adhere to Ed's answer. +1