1. Maire is a friend who always helps me.

- Mệnh đề quan hệ,"who" thay thế cho người.

2. My brother suggest I should ask my teacher for advice.

- suggest sb (should) do sth: gợi ý ai làm gì

3. His sister is too young to get married.

- be too adj to do sth: quá...để làm gì

4. You need to book tickets for the show in advance.

- need to V: cần làm gì

1. Maire is a friend. She always helps me. {Who}

=> Maire is a friend who always helps me.

2."Why don't you ask your teacher for advice?" my brother said to me. {suggest}

=> You don't need to book tickets for the show in advance.

3. "Why don't you ask your teacher for advice?" my brother said to me. (suggest)

->My brother suggested that I (should )  ask my teacher for advice

4. His sister isn't old enough to get married. (too)

->His sister is too young to get married