Place each set of words into the correct form of verb tense.
I ( buy ) groceries yesterday. He ( write ) a letter an hour ago.
I bought groceries yesterday. He wrote a letter an hour ago.
Complete the following task based on the instruction and optional input provided.### Instruction:
Place each set of words into the correct form of verb tense.

### Input:
I ( buy ) groceries yesterday. He ( write ) a letter an hour ago.

### Output:
I bought groceries yesterday. He wrote a letter an hour ago.