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Are these sentences all correct:
1-I did it slowly enough that you may see how it is done.
2-I did it slowly enough for you to see how it is done.
3-I did it so slowly that you may see how it is done.
4-I did it slowly enough that you saw how it is done.
To me 3 sounds odd.
1 and 2 imply that my intention was that you see how it is done (maybe you didn't pay attention and didn't see), while 4 implies that the result was that you saw how it is done (maybe that wasn't my intention).
enough 
Linear Mode
