Question

( use tense) I ____________ (buy) a new pair of shoes just now​

Answer 1

I bought a new pair of shoes just now.

simple past tense is used.

Answer 2

I ____bought__  a new pair of shoes just now​.

• the verb in the above sentence is in simple past tense.
• simple past tense are those verbs which had happened earlier.
• in the above sentence the pair of shoes had been already purchased so we use the verb bought of the given verb buy.
• the word now should not be confused with the tense because the speaker is telling the fact of him buying the shoes at that moment.