I was scared to think what I have done.
What does the sentence above mean?
1. I was scared when I thought what I have done.
2. I was scared of thinking what I have done.
3.I was scared upon thinking what I have done.
4. Either 1 or 2 or 3 according to context.
As a side note, is it okay not to add "of" or "about" in the sentence as in "...to think of/about what I have done" ?
CORRECTED: I was scared to think about/of what I have done. 1. I was scared when I thought about/of what I have done.
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CORRECTED:
I was scared to think about/of what I have done.
1. I was scared when I thought about/of what I have done.
2. I was scared of thinking about/of what I have done.
3.I was scared upon thinking about/of what I have done.
4. Either 1 or 2 or 3 according to context. YES
As a side note, is it okay not to add "of"