今いま、このアプリすごく流行はやってるんだって。

ima, kono apuri sugoku hayatteru n datte.

I heard this app is really popular right now. casual

去年きょねん、この色いろの服ふくがとても流行はやりました。

kyonen, kono iro no fuku ga totemo hayarimashita.

Last year, clothes in this colour became very popular. neutral