How can you complete these dialogues? weekend? 1) a: will you stay with us for the a: oh, i'm sorry. your mum will be soon did discover in 1492 be 1592? 2) a: b: in 1492, i think, but a a: let's find out doesn't he? victor speaks english and french, b: i'm that he does. 4) a: is canada bigger or smaller than the usa? b: i don't know geography very well

 Из того, что Вы предоставили, у меня получилось только так) 
1) A: Will you stay with us for the weekend?
    B: Certainly!
2) A: Oh, I'm sorry. Do you think your mum will be soon at home?
    B: No, she'll come home only in the evening.
3) A: Let's find out something. Did Christopher Columbus discover America in 1492 or in 1592?    
    B: In 1492, I think, but I am not sure. 
4) A: Victor speaks English and French, doesn't he?    
    B: Yes, he does.