Today was not a happy day.

I wasted so much time during my working hours day.

I tried to extract data from my client's system.,

Bbut I didn’t know wellenough about the system.it,

Sso it took a long time to understand how it was structure is defined.

And finallyt the end of the day, I couldn’t finish my task.

Today was not a happy day.

I wasted so much time during working hours.

I tried to extract data from my clients' system.

But I didn’t know well about the system very well.

So it took a long time to understand how the structure is defined.

And finallyIn the end, I couldn’t finish my task.

I was so disappointed...

Today was not a happy day.

I tried to extract data from my client's system.

Need the " 's " to show possession

But I didn’t know well about the system well.

So it took a long time to understand howits structure is defined.

This sentence can also be combined with the 2 previous sentences:

"I tried to extract data from my client's system but I didn't know their system well so it took a long time to understand its structure."

Today, I was not happy day.

I wasted so much time during my working hours.

But, I didn’t know wellmuch about the system.

So, it took a long time to understand how the is structure is defined.

And finally, I couldn’t finish my task.

I was so disappointed..