Overturn present into past

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I have never been taken in

and I prefer to stay safe

you have a grudge

of three decades back

for thirty years

you were planning

to get back at me

and wove an intricate net

but I have a small knife

that is razor sharp

it can whisk away

all strings of any net

this knife is my mind

and it thinks

at least three decades hence

so do not attempt

an overturn of present

into past tense!