1 . was playing

→ Last night → QKĐ : S + v2/ed + ...

→ at present → QKTD : S + was / were + Ving ... 

2 . didnt eat 

→ yesterday → QKĐ : S + v2/ed + ... 

3 . watching

→ Looking forward to + Ving : Trông đợi

I 

1. At night o'clock last night ,my babies played with their doolls in the living room at present(có last night dấu hiệu của quá khứ đơn)

2.Minh is very hungry now because he didn't eat any thing yesterday(có yesterday dấu hiệu của quá khứ đơn)

3. I'm looking forward to watching the Europoen Football tournament next week (theo cấu trúc looking forward to+Ving/N )