$I.$

$1.$ Although she will have an English exam tomorrow, she is watching cartoon.

$2.$ If we do not throw rubbish into the rivers, we will reduce water pollution. (câu điều kiện loại 1)

$3.$ He likes studying English, but his brother likes studying Math.

$4.$ They got bad marks because they were lazy. 

$II.$

$1.$ She has never been to Huong Pagoda. (Thì HTHH)

$2.$ We will go to Ha Long Bay if it's sunny next week. (câu điều kiện loại 1)

$3.$ Nam rides his bike to school everyday, but today he's walking to school.

$4.$ Please be quiet! The baby is sleeping. (Be quiet! → Thì HTTD)

$\\$

$-$ Câu điều kiện loại 1: If + S + $V_{HT}$, S + will/modal verb + $V_{inf}$

$-$ Thì HTHH: S + has/have + $V_{pII}$

$-$ Thì HTTD: S + is/ am/ are + $V_{ing}$

I.

1. Although she will have an English exam tomorrow, she is watching cartoon

2. If we don't throw rubbish into the rivers, we will reduce water pollution

3. He likes studying English, but his brother likes studying Math.

4. They got bad marks because they were lazy.

II.

1. She has never been to Huong Pagoda.

2. If it is sunny next week, we will go to Ha Long Bay.

3. Nam rides his bike to school every day, but today he is walking to school.

4. Please be quiet! The baby is sleeping.