Fill the blanks with suitable tense of the verbs in parentheses

- What ___ ( you,do ) when I ____ ( call ) you last night?

- Well,at that time,I _____ ( practise ) English in my room

`-` What were you doing when I called you last night?

`=>` diễn tả hành động đang xảy ra thì có hành động khác xen vào: When past continous, past simple 

`-` Well at the time I was practicing English in my room 

`=>` at that time `->` thì quá khứ tiếp diễn

`=>` cấu trúc thì quá khứ tiếp diễn: `(+)` S+was/were+V-ing 

` 1. ` were you doing, called

` - ` You: Chủ ngữ số nhiều ` => ` dùng " were "

` 2. ` was practising

` - ` I: Chủ ngữ số ít ` => ` dùng " was " 

` - ` Một hành động đang làm mà có ` 1 ` hành động khác chen vào ` => ` dùng thì QKTD

` ( + ) ` S + was / were + V - ing

` ( - ) ` S + was / were + not + V - ing

` ( ? ) ` Was / were + S + V - ing ?

` - ` Chủ ngữ số ít + was / wasn't

` - ` Chủ ngữ số nhiều + were / weren't

` @ ` ` kyu `