Phrases Asking for Clarification

I'm not sure I understand.

B1

Meaning

I don't completely grasp the meaning.

Example sentences

John: 'We need to implement the new software by Monday.'

Alice: 'I'm not sure I understand. What's the exact timeline?'

John: 'I'm not sure I understand. Does that mean we have less money for marketing?'

Alice: 'The budget has been reduced by 15%. '