I have not been speakingn't spoken English since I started to working. I haven't spoken English since I started working.

I have not been speaking English since I started to working. I have not been speaking English since I started working.

BETTER: I have not been speaking English since I started toing work. BETTER: I have not been speaking English since starting work.

NOTE: When *speaking* the word "I" is used frequency, but when *writing* that word is used less often. (This is one major ways that spoken and written English differ.)

I have not been speaking English since I started to working. I have not been speaking English since I started working.

I have not been speakingspoken English since I started to working. I have not spoken English since I started working.

이렇게 쓰시면 더 자연스러울 것 같아요 :)

I’ve been studiedying again and triedying to read and write because I was not good at listening and speaking at that time. I’ve been studying again and trying to read and write because I was not good at listening and speaking at that time.

During that time, I studied again and tried to read and write because I was not good at listening and speaking at that time. During that time, I studied again and tried to read and write because I was not good at listening and speaking.

I resumed studieds again and tried to read and write, because I was not good at listening and speaking at that time. I resumed studies again and tried to read and write, because I was not good at listening and speaking at that time.

I studiedarted studying again and tried to read and write because I was not good at listening and speaking at that time. I started studying again and tried to read and write because I was not good at listening and speaking at that time.

It has beem improved a lot through daily working such as by sending emails, or by attending online meeting and face to face meetings. It has improved a lot through daily work such as by sending emails, or by attending online and face to face meetings.

It has beem improved a lot through daily workingpractice such as sending emails, attending online meetings and having face -to -face meetings. It improved a lot through daily practice such as sending emails, attending online meetings and having face-to-face meetings.

It has beemn improved a lot through daily working such as sending email, attending online meeting and face to face meetings. It has been improved a lot through daily work such as sending email, attending online meeting and face to face meetings.

It has beemMy English proficiency has improved a lot through daily working activities such as sending emails, attending online meeting and face -to -face meetings. My English proficiency has improved a lot through daily work activities such as sending emails, attending online and face-to-face meetings.

It has beem improved a lot through daily working such aswith the help of daily practice, such as through sending email, attending online meeting and face to face meeting. It has improved a lot with the help of daily practice, such as through sending email, attending online meeting and face to face meeting.

It has beemve improved a lot through daily to day working such as sending emails, attending online meetings and face to face meetings. I have improved a lot through day to day working such as sending emails, attending online meetings and face to face meetings.

"I have improved"아니면 "It has improved..."이라고 쓰셔도 돼요.