These past 2 days, I washave been busy.

have been - you started being busy 2 days ago, and continued to be busy for the past two days

Use "have been" when an action starts in the and lasts at least up until the present.

I did the First Aid and CPR Training course.

It was a little bit hard during thisese times, you know, during the pandemic time.

"These times" refers to a period of time or an era
"This time" refers to one specific time (often it is the oppose

These times are challenging for all of us.
The times in ancient Greece happened long ago.

This time when I went walking, I saw a dog.
I want you to come with me this time because you didn't come last time.

There were only 6 students in the class room.

"classroom" is 1 word in English
but "living room" is 2 words
It depends on the specific example if it is 1 or 2 words

Every one had their own space and materials to keep their distance.

everyone - 大家
every one - 每一个（东西/人）

Everyone stood up.
Every one of the toys was red.
Every one of us was happy.

We didweren't allowed to change position and doingmove around the room or do any team work.

Of course we had to wear a mask all the time.

But his speaking was a little bit fast, and there were many words that I doidn't know, especially the names of diseases and medicines.

Some times I had to ask him to spelling them, and then translated them.

Theose 2 days, I was busy.

I did thea First Aid and CPR Taining course.

It was a little bit hard doing it during this time, you know, because of the pandemic time.

Every one had their own space and materials to keep distance.

We didweren't allowed to change positionmove around and doing any team work.

Of course we had to wear masks all the time.

But his speakingech was a little bit fast, and there were many words that I doidn't know, especially the names of diseases and medicines.

Some times I had to ask him to spelling them out, then translated them.