Great tips! Thank you, Jeff.

This is a correct use of “buckle down.” A few tips on the rest:

1. Instead of “must,” it sounds more natural to say, “I need to buckle down”‘
2. It might be more natural to put “A few months ago” at the beginning: “A few months ago, my professor asked me to write an article, so I need to buckle down…”
3. You can say, “I will feel embarrassed” but it’s more common to say, “I’ll be embarrassed.”

“Buckle down” is correct. However, I don’t think “change my job” is what you mean. I think you mean, “I will get a new job.”

Great examples!

In your first, I wouldn’t say “do seriously my lessons” instead, I would say, “work hard on my lessons”: “…I buckle down and work hard on my Plain English lessons.”

In the second, that’s perfect. And sometimes it takes a while to channel our energies in the right direction 🙂

Great!

Great example. A few tips:

1. I think instead of “move away,” you might want to say “stay away.”
2. “In this days” = you can say, “These days, there are many…” SEe this video: These days
3. Usually after “buckle down” we put an action, so you can say, “buckle down and do our important tasks” or “…and do what we need to do.”

“These days, there are many distractions like social media. It’s important to stay away from them and buckle down and do our important tasks.”

Hi Eduardo, as I read “doing the presentation” I think of a person giving a presentation. I think you might mean to prepare the presentation (create the content, design the visuals/slides). If that’s what you mean, the word “create” could work. You can say, “…you must analyze the information and then buckle down and create the presentation.”

Great example, Rafael, and “buckle down” is perfect here. One tip for you:

1. “practice” is not a countable noun in English, so we would not say “practices” (This is different from Spanish, where “prácticas” is countable). Instead, you can say “buckled down to complete the practice exercises” or “buckled down to do the practice”

2. Remember to put “to” after the word listen

“After listening to each lesson every week in class, I always buckled down to complete all the activities and practice exercises right away.”
“After listening to each lesson every week in class, I always buckled down to complete all the activities and do the practice right away.”