write + (past) + had better do
kaita hou ga ii
had better do; should (advice)
meaning: had better write
傘、持って行ったほうがいいよ。
kasa, motte itta hou ga ii yo.
You'd better take an umbrella. casual
連休は混むから、早めに予約したほうがいい。
renkyuu wa komu kara, hayame ni yoyakushita hou ga ii.
It gets crowded over the long weekend, so you had better book early. neutral