Anonymous 1- There were riots as I have never seen before. 2- There were riots like I have never seen before. 3- Those were riots as I have never seen before.
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Anonymous1- There were riots as I have never seen before.I would use 2 and 4. To my ear, these are alternate forms of something like these:
2- There were riots like I have never seen before.
3- Those were riots as I have never seen before.
4- Those were riots like I have never seen before.