I'm pretty sure you're allowed to write in First-Person, but make sure to make it clear you're writing about someone else's perspective.
Answer:
1. We have to help the students practice filling punctuation into a document in their after-hours lessons
2. Tell them the use of punctuation in writing essays or doing homework or even in competitions in order not to make misunderstand for examiner
Explanation:
She greets Harry warmly, and then stormily chastises her boys, setting them to work de-gnoming the garden.
The tiny grains of sand are tan.
I tried to make it longer, but I didn't like how it sounded at first. I hope this is good enough. :)
A little helpful hint though: questions like these are actually quite easy. All you have to do is basically describe whatever you're being asked to, just think of some words that could "describe" the topic, for example; tan, tiny, smooth, etc can be describing words. It's super easy. ☺
