How to use the continous tense
I see you are studing English
I see you studing English
I see that you are studing English

Pardon, What of the 3 sentenses are correct and more common. Thanks so much

Question

How to use the continous tense
I see you are studing English
I see you studing English
I see that you are studing English

Pardon, What of the 3 sentenses are correct and more common. Thanks so much

Answer

"I see that you are studying English." is correct. But "I see you are studying English" is quite common as well. "I see you studying English" Means that you are watching them study. XD

Answer

Continuous form (it's not a tense) is "[to be] + [verb]ing".  "I see you studying English" is not continuous form.

Aside from that, all your sentences are correct. Is there something else which confuses you?

Answer

I see that you are studying English!

Answer

It's a participle phrase. It's upper-level grammar.