Ответ:
1) We're going to have a picnic on Saturday.
2) She lives quite far away, so she's going to be late;
3) I'm having a party on my birthday;
4) My brother is flying to to Milan this weekend
5) It's snowy! Let's go skiing.
6) We're going to catch a bus because it's quiker.
7) That's all for now. Write soon.
8) He's got a broken leg so he can't play football;
9) Mark and Sue are going to go skiing at the weekend
10) Do you want to visit art gallery?