Sentence: Would you mind coming early tomorrow?
coming - present tense, Would - past tense.
I am confused, can we put two different tense in a sentence?
yes
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kingston123can we put two different tense in a sentence?
Yes, and the modals, especially 'would' and 'could' are very frequently seen in present tense contexts.
However, 'coming' is simply the form of the verb required after the verb 'mind'; it has no tense of its own. Search "catenative verbs" online if you want to learn more about this.
CJ