Question

【题目】His father writes a letter with a pen. (改为现在进行时)

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Answer 1

【答案】His father is writing a letter with a pen.

【解析】

原句句意：他爸爸用钢笔写信。改为现在进行时态，即be doing结构，主语是三单，故系动词用 is，故答案为His father is writing a letter with a pen.