1. Each of you brings the photograph taken during the summer vacation.

2.After pasting the picture on a piece of paper, write down an explanation about the picture in English in brief.

3. After gluing the pictures on a big piece of drawing paper, hold a group photo exhibition.
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Are the directions above all grammatical?

Do I have to use 'picture' or 'photograph'?

Can I use 'have a group photo show' instead of 'hold a group photo exhibition'?

A better way to phrase these would be:

Each of you will bring a photograph taken during summer vacation.

After pasting the photograph on a sheet of paper, write down a brief explanation in English.

We will glue all of these on a large sheet of drawing paper and hold a group
photo exhibition.

( You may use either show or exhibition.)

1. Yes, the directions above are all grammatical.

2. Regarding the use of "picture" or "photograph," both terms are generally used interchangeably and are acceptable in this context. You can choose whichever term you feel most comfortable with.

3. Yes, you can use "have a group photo show" instead of "hold a group photo exhibition." Both phrases convey the same idea of organizing an event to display the group's photographs. You can choose the phrase that sounds more natural or aligned with the tone and context of the overall instructions.