$\text{1.}$ Mary was too tired to study any more.

$\text{→}$ too + adj + (for sb) to-V

$\text{2.}$ The boys aren't old enough to play in the street.

$\text{→}$ adj + enough + (for sb) to-V

$\text{3.}$ This car isn't cheap enough for him to buy.

$\text{4.}$ Jim was too shocked to say anything.

$\text{5.}$ Alice isn't tall enough to be a model.

$\text{6.}$ It is always nice to meet old friends.

$\text{→}$ It is + adj + to-V

$\text{7.}$ Helen was too excited to sleep.

1.Mary was too tired to study anymore.

2. The boys aren't old enough to play in the street.

3. This car isn't cheap enough for him to buy.

4.. Jim was too shocked to say anything.

5.. Alice isn't tall enough to be a model.

6. It is always nice to meet old friends.

7. Helen was too excited to sleep