are these phrases correct?

 I went snowboarding with my friends which was first time in this season. It was about two yeas ago since I last did. I think I would like to go more frequently, at least once in a year, though.

 The weather was sunny on the day, and there was a few people on the piste more than average, so I could be slipping with pleasant feeling.

1.   Please don’t say anything to anyone.
I’d rather you didn’t say anything to anyone.

1.   He’s shy.
I wish I weren’t shy.

LO = learning object

Considering all aspects, the automobile has affected the daily life of people more than bicycles and airplanes have done.

Considering all aspects, the automobile has affected the daily life of people more than bicycles and airplanes have done.

時間が空いたのでとりあえず何かかくことにした。

日本は現在雪が大変です。雪かきが終わったところだ。

高速、空港、電車、バス、すべて止まってる。

今週は降り続けるそうだ。

I'm sorry. I'm not writting for long time.