"so?that"有如此程度，以致??"，而 "too?to"则有如此程度以致不能? ?"的意思。故此在 "too?to"后不须再有否定字眼，如果有，必须双重否定的情况出现。
拓展资料
so?that
1、They may be able to help with childcare so that you can have a break .
他们可以帮忙照料孩子，这样你就可以歇一歇了。
2、All right, so that's that.
好吧！这事儿就这样了啦。
3、I set up the computer so that they could work from home.
我把电脑设置好，这样他们就可以在家办公了。
4、You have to carry a bleeper so that they can call you in at any time.
你要随身带着寻呼机，以便他们随时呼你。
5、I'll give you all the facts so that you can judge for yourself.
我把所有事实都告诉你，使你得以自己作出判断。
6、He may find the line cut on the telephone so that he can't get through .
他可能会发现电话线被切断了，所以打不通。
7、We perfected a hand-signal system so that he could keep me informed of hazards.
我们完善了一套手势信号，这样他就能随时告知我什么时候有危险了。
too?to
1、He hit her on the head, causing her too to spurt blood.
他击中了她的头部，她也开始流血。
2、I know you need your freedom too much to stay with me.
我知道你太需要自由了，无法和我在一起。
3、It was all too easy to believe it.
这太容易令人相信了。
4、It's too late to back down now .
现在打退堂鼓已经太晚了。
5、It's too common to mention.
这太平常了，不值一提。
6、It's too late to go to the football match now; besides, it's beginning to rain.
现在去看足球比赛太晚了；况且老天又开始下雨了。
7、They are too young to understand what is going on.
他们还太小，不明白发生了什么事。