`1.` I haven’t had such a delicious pizza before

S + has/ have + (not) + V_ed/ V3 + before

`2.` I last took a bath since Monday

S + last + V_ed/ V2 + since + mốc thời gian

`3.` When did you start volunteering in this area?

When + did + S + start + V_ing?

`4.` How long have they looked for their child?

How long + has/ have + S + V_ed/ V3?

`5.` This is the first time I have had chatted with him

This is the first time + S + has/ have + V_ed/ V3

`6.` Did you start attending this class 4 weeks ago?

Did + S + start + V_ing + khoảng thời gian + ago?

`7.` Has she made these cupcakes for 50 minutes?

Has/ Have + S + V_ed/ V3 + for + khoảng thời gian?

1.I haven't had such a delicious pizza before . 

-> This is the first time + S+ has/have + Vpp 

-> S+has/have + (not) + Vpp + ... + before 

2.I last took a bath on Moday . 

-> S+last + Ved/cột 2 + ..... 

3. When did you volunteering in this area ?

-> How long have/has+S+Vpp ?

-> When + did + S+ V-inf ? 

4.How long have they started looking for their child ? 

-> How long + has/have + S+ Vpp ?

5.This is the first time I have chatted with him . 

-> This is the first time + S+ has/have + Vpp  

6. Did you attend this class 4 weeks ago ?

-> Did + S+ V-inf + ... ?

7.Has she started making these cupcakes for 50 minutes ?

-> Has/have + S+ Vpp + ... ?