爷爷正在看书。爸爸正在写电子邮件。妈妈。

Grandpa is reading a book. Dad is writing ane-mail. Mom.

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爸爸正在写电子邮件。

Dad is writing an email.

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他正在写一封电子邮件给他的美国朋友。

He is writing to his American friend.

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他正在书房写电子邮件。

He's writing a certain email in the study.

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汤姆正在学校给他爸爸写电子邮件。

Tom is writing ane-mail to his father in the school.

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汤姆正在学校给他爸爸写电子邮件。

Tom is writing ane-mail to his father in the school.

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