$1$. The coffee isn't strong enough to keep us awake
$2$. The river is too deep for us to wade in it
$3$. He is too lazy to get up early
$4$. If he gets up early enough, he will catches the fast train
$5$. Would you be very good enough to forward my letters while I am away
`->`CT "enough...to.." ( đủ...để... ):
$-$ S + be/V + adj/adv + enough + (for sb ) + to + V-inf
$-$ S + V + enough + N + (for sb) + to V-inf
`->`CT "too...to" ( quá...để.. ): S + be/V + too + adj/adv +(for sb) + to + V-inf