Ответ:

1. I am taking my sister to school now.

2. Mike and Sam aren't playing tennis at the moment.

3. My mother is working at her office now.

Ответ:

1. I'm taking my sister to school now

2. Mike and Sam are not playing tennis at the moment

3. My mother is working at her office now

Объяснение:

конструкция презент симпл:

подлежащее, am/is/are, глагол+ing

am - I

is - he, she, it

are - we, you, they