All I do is to make coffee. So according to this, I think 1 and 3 are correct, not sure though. In this example you have 'do'.
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NugsoAll I do is make coffee.All I do is to make coffee. So according to this, I think 1 and 3 are correct, not sure though.In this example you have 'do'. That makes a difference. So you can't conclude that 1 and 3 are correct just because these examples with 'do' are correct.