The past tense of trust someone as far as one can spit is trusted someone as far as one can spit.

The third-person singular simple present indicative form of trust someone as far as one can spit is trusts someone as far as one can spit.

The present participle of trust someone as far as one can spit is trusting someone as far as one can spit.

The past participle of trust someone as far as one can spit is trusted someone as far as one can spit.