The old woman is _____weak ____look after herself.填too to还是so that ,说明为什么

问题描述:

The old woman is _____weak ____look after herself.填too to还是so that ,说明为什么

The old woman is (too) weak (to) look after herself.
too to 结构构成的是简单句,而so that构成的是从句,如:
The old woman is so weak that she can't look after herself.