One of his favourite pastimes was doing nothing. His idea of an energetic afternoon when the sun was shining was to sit under a tree, with a pretty girl by his side, and all the time in the world to talk of this and that, to count the blades of grass.

【翻译】他最喜欢的消遣之一就是什么也不做。他想象着，在一个阳光明媚、精力充沛的的下午，坐在一棵树下，一个漂亮的姑娘在他身边，在这个世界上所有的时间里，谈论着这个，谈论着那个，数着草叶。

【分析】句子主干是（见红色部分）：

His idea of an energetic afternoon when the sun was shining was to sit under a tree, with a pretty girl by his side, and all the time in the world to talk of this and that, to count the blades of grass.

他的想法是 坐在树下，高谈阔论，数着草叶。

all the time in the world to talk of this and that, to count the blades of grass，是动词不定式，作was 的表语，与前面的sit under a tree 并列。all the time in the world 一个时间状语、一个地点状语，修饰后面的 to talk...，to count...。