$2.$ The more tired you are, the harder it is to concentrate.

$3.$ The sooner we decide what to do, the better. 

$4.$ The more I know, the less I understand.

$5.$ The more electricity you use, the higher your bill will be.

$6.$ The longer Kate waited, the more impatient she became.

- The + Comparative + S₁ + V₁, the + Comparative + S₂ + V_2.

$@vanw$

2. The more tired you are, the harder it is to concentrate.

 The + Comparative adj _er+ S1 tobe + V1, the + Comparative adj_er + S2 + V2_.

3. The sooner we decide what to do, the better. 

4. The more I know, the less I understand.

5. The more electricity you use, the higher your bill will be.

6. The longer Kate waited, the more impatient she became.