1. Unless people throw rubbish into the right bin, they won't keep the environment clean

2. If we use reusable bags for shopping, we will reduce waste

3. Unless people travel more by public transport, the harmful gases in big cities will be reduced

Giải thích:

Câu điều kiện loại 1: If/Unless + S + V(s/es), S + will (not) + Vinf

Unless = If...not

`-` CĐK Loại 1 :

`+` If - clause : Thì HTĐ : S + Vs / es / không s , es

`+` Main - clause : Thì TLĐ : S + will + V

`-` Unless `=` If not : Trừ phi

`1`.Unless people don't throw rubbish into the right bin , they will keep the environment clean

`2`.If we use reusable bags for shopping , we will reduce waste

`3`.Unless people don't travel more by public transport , the harmful gases in big cities will be reduced

`\text{# Kirigiri}`