$1.$ Why didn't you go to school last Monday?
- Did + (not) + S + V (bare) + O...?
$2.$ It takes them thirty minutes to go to school.
- It + takes + O + time + to V.
$3.$ You'd better not eat too much meat.
- S + ('d) had better + (not) + V- infinitive.
$4.$ The colorful little fish is the most beautiful fish.
- S + tobe + the + most + adj + N ....
$5.$ Both my brother and I like roller skating.