Todayhis morning I had an interesting but also a strange experience. This morning I had an interesting but also strange experience.

You're only talking about one experience, so "an" is the article that covers that With what you had, it almost sounds like you're saying "This morning I had an interesting experience but also a strange experience" (two separate experiences)

Today / This morning I had an interesting but also a strange experience. Today / This morning I had an interesting but strange experience.

"Today morning" does not sound correct.

Todayhis morning I had an interesting but also a strange experience. This morning I had an interesting but also strange experience.

Todayhis morning I had an interesting but also a strange experience. This morning I had an interesting but also a strange experience.

I had an interview with 3 respresentatives of a big and famous company. I had an interview with 3 representatives of a big and famous company.

I had an interview with 3three respresentatives of a big and famous company. I had an interview with three representatives of a big and famous company.

I had an interview with 3 respresentatives of a big and famous company. I had an interview with 3 representatives of a big and famous company.

I had an interview with 3 respresentatives of a big and famous company. I had an interview with 3 representatives of a big and famous company.

During the interview, I suddenly forgot all themy words and ended up sitting silently. During the interview, I suddenly forgot all my words and ended up sitting silently.

Grammatically good, "all the words" sounds a little odd here because when you use "the" it sounds like you're referring to a specific subset of words, such as a speech, or lyrics to a song, not the entire English language. Now, if you had rehearsed a speech before the interview and had mentioned that in the previous sentence, and you were referring to the words in the speech, it would be natural. "my words" is a sort of set phrase that can refer to your own personal lexicon, "forgot how to use my words," "forgot my words" etc

During the interview, I suddenly forgot all the words and ended up sitting silently. During the interview, I suddenly forgot all the words and ended up sitting silently.

"forgot all the words" is unclear. Which words? Words you prepared, or how to speak at all? It would help the reader to understand if you were more specific.

During the interview, I suddenly forgot all themy words and ended up sitting silently. During the interview, I suddenly forgot all my words and ended up sitting silently.

It was frustrating and (made me feel unprepared / left me feeling unprepared). It was frustrating and (made me feel unprepared / left me feeling unprepared).

The phrase "left me feeling unprepared" is a little more idiomatic.

It wThis has already happened two or three times when I was speaking in Italian or German because I know those languages rather badly, especially for an important business talk. This has already happened two or three times when I was speaking in Italian or German because I know those languages rather badly, especially for an important business talk.

It was already This has happened two or three times when I was speaking in Italian or German because Imy knowledge of those languages rather bais limited, especially for an important business talk. This has happened two or three times when I was speaking in Italian or German because my knowledge of those languages is limited, especially for an important business talk.

It wasThere were already two or three times when I was speaking in Italian or German because I know those languages; rather bad, especially for an important business talk. There were already two or three times when I was speaking in Italian or German because I know those languages; rather bad, especially for an important business talk.

The semicolon separates the comment on speaking in Italian and German - without the semicolon is sounds like "rather bad" is describing your Italian and Germany skills.

It was already two or three times when I was speaking in Italian or German because I don't know those languages rather badwell, especially for an important business talk. It was already two or three times when I was speaking in Italian or German because I don't know those languages well, especially for an important business talk.

I feel frustrated now because I wanted to show my best myself but in reality I showed that I unideal'm not an ideal candidate and "lost my face " in front of others. I feel frustrated now because I wanted to show my best self but in reality I showed that I'm not an ideal candidate and "lost my face " in front of others.

Edit: I had a brain fart and forgot this was an interview, in this case "not an ideal candidate" sounds more natural Otherwise it sounds like you're saying you're not an "ideal human being"

I feel frustrated now because I wanted to show my best myself, but in reality I showed that I unidealwas not ideal for the job, and "I lost my face " in front of others. I feel frustrated now because I wanted to show my best self, but in reality I showed that I was not ideal for the job, and I lost face in front of others.

If you felt embarrassed or humiliated then you did lose face, so no need for quotations around the expression.

I feel frustrated now because I wanted to show my best myself but in reality I showed that I unwasn't ideal and "lost my face " in front of others. I feel frustrated now because I wanted to show my best self but in reality I showed that I wasn't ideal and "lost my face " in front of others.

"my best self" already includes "my".

I feel frustrated now because I wanted to show my best myself but in reality I showed that I am unideal and "lost my face " in front of others. I feel frustrated now because I wanted to show my best myself but in reality I showed that I am unideal and "lost my face " in front of others.

I think it happened because I was too nervous and overthinking things. I think it happened because I was too nervous and overthinking things.

Next time, I 'll try to stay calm by taking deep breaths. Next time, I'll try to stay calm by taking deep breaths.

Next time, I will try to stay calm by taking deep breaths. Next time, I will try to stay calm by taking deep breaths.

Next time, I will try to stay calm by taking deep breaths. Next time, I will try to stay calm by taking deep breaths.

The lLesson is learned Lesson learned

"The lesson is learned." <--- okay "Lesson learned" by itself is a commonly used phrase for when you learn from something bad happening to you

The lLesson is lLearned Lesson Learned

The l(A) Lesson is lLearned (A) Lesson Learned

The lLesson is lLearned The Lesson is Learned