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Question

1. Who are you waiting for? I am waiting for my friend. Have you been waiting for a long time? Yes, I have been waiting for 1 hour already. Do you often wait for him here? Yes, I do. 
2. What are you translating? I am translating an article. How long havу you been translating it? I've been translating it for 2 hours already. I translate three articles a week. 
3. Don't enter the classroom. The students are taking an exam in there. They've been taking it since 9 a.m. Students usually take -5 exams every term. 
4. Don't go outdoors! It's raining. It's been raining since early morning. It often rains in Moscow in autumn. 
5. Can I talk with Nikolai? No, you can't, he's having dinner. Please, wait for a while. Has he been having dinner for a long time? Yes, he's been having dinner for half an hour already. He usuaaly has dinner at this time.

Дмитрий Ласс · Accepted Answer

1. Who are you waiting for?(Present Continuous) 
I am waiting for my friend.(Present Continuous) 
Have you been waiting for a long time? (Present Perfect Continuous) 
Yes, I have been waiting for 1 hour already.(Present Perfect Continuous) 
Do you often wait for him here? Yes, I do. (Present Simple) 
 
2. What are you translating? (Present Continuous) 
I am translating an article.(Present Continuous) 
How long havу you been translating it?(Present Perfect Continuous) 
I've been translating it for 2 hours already.(Present Perfect Continuous) 
I translate three articles a week. (Present Simple) 
 
3. Don't enter the classroom. (Present Simple) 
The students are taking an exam in there. (Present Continuous) 
They've been taking it since 9 a.m. (Present Perfect Continuous) 
Students usually take -5 exams every term. (Present Simple) 
 
4. Don't go outdoors! It's raining. (Present Continuous) 
It's been raining since early morning. (Present Perfect Continuous) 
It often rains in Moscow in autumn. (Present Simple) 
 
5. Can I talk with Nikolai? (Present Simple) 
No, you can't, he's having dinner. (Present Simple, Present Continuous ) 
Please, wait for a while. (Present Simple) 
Has he been having dinner for a long time? (Present Perfect Continuous) 
Yes, he's been having dinner for half an hour already. (Present Perfect Continuous) 
He usuaaly has dinner at this time. (Present Simple)