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Hi,
I have just joined.
This social network I hope this social network will help my English!

 

Hi Omar!  The above text is correct and understandable, I'd probably rewrite it as:

 

Hi,

I have just joined italki.<em></em><em></em>

<em></em>I hope this social network will help me improve my English!

Though they're similar, "especially" is more common, while "specially" tends to have a fairly specific use. Use "especially" when you mean "particularly" or "exceptionally." It implies that something deserves special mention. He played especially well in today's game. I love desert, especially ice cream! Use "specially" if you want to stress that something is distinctive. The glasses have specially designed lenses to protect against UV radiation.

"Have your back" means "support you," "assist you," "defend you," or something similar.

Hi Terry! Some researchers define an ecological niche as a "n-dimensional hyperspace" in which the different dimensions are the different ecological and environmental factors acting on the organism (temperature, humidity, seasonality, rainfall, sunlight, etc.). So, perhaps this is what you're describing? An animal exists in the real world in its niche, and its behaviors are influenced by (and likely responses to) its ecological niche (i.e. the factors in this hyperspace). I hope this helps!! Let me know if you don't understand any of the terms I've used above!

Today.

I'm happy today.
I woke up very late this morning because I couldn't sleep last night. Because of that, all the plans that I have had for the day broke down [expired] <em>(We'd probably say "fell through" or "fell apart" here)</em>.
On During lunch, my brother phoned to me to asking if I can could take care of his dog (called Ron) his that afternoon. I don't like dogs, but I have had to answers, "Yes, brother, no problem!" But, for to myself, I said, "Really? Are you kidding me, brother?"
And this afternoon I had to take care of both his dog, and for my sister's dog (called Queen).
In the evenning, my aunt, uncle and cousin came to my house (and I can could take a break about from the dogs hahaha).
We drink drank coffee, tea and chocolate. And mMy uncle knows a lot about computers., so I made the most of the situation and told him that in my portatil-computer laptop didn't work with the Wi-Fi. My uncle repaired it!