127 l can hardly imagine peter__across the atlantic ocean in five dayssailingwhy?

127 l can hardly imagine peter__across the atlantic ocean in five dayssailingwhy?
127 l can hardly imagine peter__across the atlantic ocean in five days
sailing
why?

127 l can hardly imagine peter__across the atlantic ocean in five dayssailingwhy?
imagine sb.doing sth.意思是‘设想某人做某事’
句意：我无法想象Peter能在五天内航行穿越大西洋.

imagine意为“猜想，料想，想象”，它没有进行时态。
imagine用作及物动词，其后直接跟宾语。名词、动词的-ing形式等作它的宾语。所以题中只能用sail的 ing形式sailing.
imagine用作不及物动词，意思是“想象，幻想”。常用于感叹句或插入语

imagine sb. doing sth. 表示“想象某人做某事”。属于固定搭配。
本句句意为：我很难想象彼得能在5天内开船横渡大西洋。

imagine+fact or imagination====>imagine+noun or state
thus sailing is being used here

imagine doing sth. 是固定短语
peter是doing逻辑主语，也可以用所有格形式