這是什么句式（的意思是）

1、Such sentences do not always occur in thinking,and when they do they are merged with vague imagery and the hint of unconscious or subliminal activities going on just out of range.2、 Thinking, as it happens, is more like struggling, striving, or searching for something than it is like talking or reading. Words do play their part but they are rarely the only feature of thought.

“and when they do they”,as it happens這是什么句式？的意思是？going on just out of range的意思是？是短語嗎？do play their part的意思是？rarely，only 在該句中的意思是？

1 你斷句錯誤，and when they do為時間狀語從句，they是主句的主語。do為助動詞替代，替代前面occur in thinking.

2 as it happens在此為時間狀語從句，it指代thinking，當思維發生時，

3 going on just out of range. 在思維范圍以外進行著。為with復合結構中的賓補。

4 rarely為半否定詞，幾乎不。only：唯一的，僅有些。

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