Mistakes/ Good language
100

You don't used to smoke before

You didn't use to smoke before

200

If I sleep well, I will feel happier

PERFECT!

If I sleep well, I will feel happier

300

When I have a breakfast I don't want to watch video on my laptop.

When I have breakfast I don't want to watch a video on my laptop.

400

I think this is good advice for people, especially about physical activity, because many people don't do exercises in the morning generally and don't like sports.

I think this is good advice for people, especially about physical activity because many people don't do exercises in the morning generally and don't like sport.

500

However I agree that I need to cut down coffee per day.

However I agree that I need to cut down ON coffee during the day. 

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