How can you complete these dialogues?
1)A; Will you stay with us for the weekend?
B...
A; Oh, I m sorry. I hope your mum will be better soon
2)A; Did Columbus discover America in 1492 or 1592?
B; In 1492, I think, but... .
A; Let s find out

1) B.    I would love to, but my mum became unwell, so I have to stay by her side until she gets better.

2) B.   In 1492, I think, but there are some people who claim that Columbus reached America in 1592.

По третьему образцу Вы дали не полный пример