4. She is proud of being such a good cook.

$\Longrightarrow$ She prides herself on being such a good cook.

$-$ proud of sth/Ving = pride oneself on sth /Ving : tự hào về 

$-$ Cô tự hào vì mình là một đầu bếp giỏi.

5. The water was so cold that the children couldn’t swim in it.

$\Longrightarrow$ The water wasn’t warm enough for the children to swim 

$-$ S +be so adj that +clause

$-$ (adj/adv) enough (N) (for sb) to do dth 

$-$ Nước không đủ ấm để trẻ con bơi