`6.`Those apples aren't ripe enough for us to eat.
`7.`Mr.Robinson isn't rich enough to buy a house.
`8.`The worker is clever enough to make fine things from wood.
`9.`He wasn't very exprienced enough to do the job.
`10.`She isn't old enough to ride a motorbike.
`11.`The boy is too young to understand this.
`=>`Cấu trúc :
`-`”enough....to” ( đủ ....để...) :
+) S + V + adj /adv + enough (for O) + to V
+) S + V + enough + N + to V
+) S + be + Adj + enough + to V
`-`”not enough...to” ( không đủ....để....)
+) S + do/does/did not + V + adj /adv + enough (for O) + to V
+) S + do/does/did not + V + enough + N + to V
+) S + am/is/are not + enough + to V