I. Rewrite the following sentences without changing their original meanings.

1. I have no idea when I should take that English test. (TO)

→ I have no idea when to take that English test .

2. “ Have you ever tried calling a helpline?” the teacher asked Ngoc. IF

→ The teacher asked Ngoc  if she had ever tried calling a helpline.

3. His parents raised him very strictly. UP

→ His parents grew up very strictly.

4. “Should I tell this to her?” he asked himself. WHETHER

→ He wondered  what to tell her.

5. It’s the first time Mary has gone to Viet Nam. BEFORE

→ Mary has never gone to Viet Nam before.