Tricky uses of "dao"

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You probably learned the result complement 到 a long time ago, as part of words like 看到 ("to see") and 听到 ("to hear"). But other times it's less clear what the 到 really means. Like the difference between 买 and 买到 or 做 and 做到. What 到 adds is a clearer sense that something has really been achieved.

做到我相信你一定能做到。

买到这里很难买到进口食品。

拿到他偷偷进了她的房间，拿到了他想要的东西。

想到看到这张照片，我想到了我的女儿。

追到如果你追到了她，我就请你喝酒。

感到听到这件事以后，我感到很难过。

猜到他们是夫妻，我早就猜到了。

了解到从他那里，我了解到了这个女人很多事。

意识到我有很多工作，我没有意识到现在已经十点了。

联系到我们二十年没见面了，我不知道怎么联系到他。