`1.` It's difficult for me to wake up early in the morning.

`=>` Waking up early in the morning is difficult for me

`=>` I find getting early in the morning difficult

`=>` I find it difficult to get up early in the morning

`2.` (với N) - I find English interesting to study.

`=>` I am interested in studying English

`3.` It's cool to try your best for what you want.

`=>` Trying your best for what you want is cool

`=>` I find it cool to try your best for what you want

`4.` Studying literature is hard.

`=>` It is hard to study literature

`5.` It is important to master a foreign language.

`=>` Mastering a foreign language is important 

`6.` I find it difficult to learn German.

`=>` It is difficult for me to learn German.

`7.` To save/saving money is very difficult for me.

`=>` It's very difficult for me to save money

`@` Kiến thức :

`-` It’s adj (for Sb) to do sth: Như thế nào với ai để làm gì ?

`=>` Doing sth be ADJ (for sb)

`=>` S find Ving/ it/ N + ADJ to do sth