1. If I were you, I wouldn't spend over 180 minutes a day surfing social media. --> 2 I haven't learned about a healthy diet for 3 months. -->

1. You shouldn't spend over 180 minutes a day surfing social media. 

`-` S + shouldn't + V_inf : Ai không nên làm gì

2. The last time I learned about a healthy diet was 3 months ago.

`-` The last time + S + V2/ed + O + was + time + ago : Lần cuối

`1`. You shouldn't spend over `180` minutes a day surfing social media. 

`->` S + should + V_inf: nên làm gì

`->` spend + time + V_ing: dành bao lâu làm gì

`2`. It has been `3` months since I last learned about a healthy diet.

`->` It has been + time + since + S + last + V_ed/c2...