1 : was

QKĐ tobe : S + was / were + ..

DHNB : Yesterday

2 : won't be

TLĐ : S + won't + V nguyên mẫu

DHNB : Next sunday

3 : Was he ... - Yes he was

QKĐ tobe : Was / were + S + ...

Cách trả lời : 

Yes + S + was / were

No + S + wasn't / weren't 

4 : does

HTĐ : S + Vs/es

DHNB : often

5 : Did - go

QKĐ : Did + S + V nguyên mẫu

DHNB : last night

6 : will be

TLĐ : S + will + V nguyên mẫu

DHNB : next week

7 : will stay

TLĐ : S + will + V nguyên mẫu

DHNB :tomorrrow 

`1.` was 

`->` Dấu hiệu: yesterday 

`=>` I,she,he,it + was (QKĐ - Động từ tobe) 

`2.` will not be 

`->` Dấu hiệu: next Sunday 

`=>` S + will not (won't) + V_inf (Tương lai đơn) 

`3.` Was he 

`->` Dấu hiệu: last night 

`=>` Was + I,she,he,it + V_inf? (QKĐ - Động từ thường) 

`4.` does 

`->` Dấu hiệu: often 

`=>` He,she,it + V(s,es) (HTĐ - Động từ thường) 

`5.` Did you go 

`->` Dấu hiệu: last night 

`=>` Did + S + V_inf? (QKĐ - Động từ thường) 

`6.` will be

`->` Dấu hiệu: next week 

`=>` S + will + V_inf (Tương lai đơn) 

`7.` will stay 

`=>` Dấu hiệu: tomorrow (Tương lai đơn)