I had visions of myself sitting at a table on a large verand

I had visions of myself sitting at a table on a large veranda.请问为什么这句话had后面的动词用的是第三人称单数形式?

I had visions of myself sitting at a table on a large veranda.
我想象我坐在一个大阳台的桌子上.
这里的短语 have visions of = imagine,是“想象”的意思.
vision(s) 是名词.
不明白可继续提问,

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