Last year I visited Canada during my summer vacation because it was too hot at my place at that time. But, in Canada, the weather was pleasant. Only for a few days, within a month, I found that it was sunny. I was in the park one day and the day was so bright and sunny. Suddenly, I saw how the weather changed into cloudy, foggy and rainy etc. It was overcast and after a moment it looked like raining. I went to the hills, there started drizzling and it was breezy too. After sometime, I wanted to go back to the hotel and on the way, it was down-pouring yet I forgot to take my umbrella along with me. So, I was frozen and completely wet. Finally, I reached the hotel room. After dinner, I decided to go for a walk. While walking, I felt it was so foggy outside. I couldn’t see anything. The view of the city wasn’t very clear because it was covered in thick smog. Mostly in winter, there's blustery wind, thunder storms like typhoon, tornado and hurricane etc. But overall, I think the weather was amazing in Canada.

A big challenge for me is to speak foreign language the way natives speak. I'm learning English and French and when I listen to natives speak, sometimes I get confused with some words or sentences because as a native I understand that we speak faster, so a big challenge is to learn the expressions that natives use

In the 1st sentence you are asking how can she be beautiful, how can someone else say that because you don't think she is. In the 2nd sentence you think she is so beautiful that you can't believe she is real. It is more rhetorical question.

'Have to' is used to express someone else's obligations. e.g. You have to pick her up at the airport in two days. 'Must' is used to express your own obligations. e.g. I must remember to hand in the paper on Monday.

I was very happy to see (I was very happy when I saw) a couple in this evening who were holding each other's hands and crossing the road very carefully as (because) the lady was pregnant.