What is the past tense of this?

Answer 1

that

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That above isn't true. Proved wrong right there. The verb is past tense. 'This' is not a verb in most cases. If it the sentence is 'to this', then it is 'to that'. Otherwise, the verb in the sentence is past. "I talked about this" instead of "I talk about this". If you use "Is this your bag?" past would be "Was this your bag?" or "was that?" It depends on the verb or as seen as 'was or is'. This is very similar to that.

Answer 2

The past tense of "this" is "was" or "used to be" depending on the context.