시제 관련 자료 정리

Present perfect simple and perfect continuous

출처 : British Council Learning English

 https://learnenglish.britishcouncil.org/en/intermediate-grammar/present-perfect-simple-and-present-perfect-continuous

Past continuous and past simple

출처 : British council Learning English

https://learnenglish.britishcouncil.org/en/beginner-grammar/past-continuous-and-past-simple

이해하기 힘든 문장들 

As soon as I saw the accident I called the police

What have you been doing? You're covered in flour