$\text{1.}$ It's age since I last saw Alice . 

→ It's + time + since + S + last + Ved/cột 2 

→ S + hasn't/haven't + Vpp 

$\text{2.}$ The last time she last phoned me was 3 months ago . 

→ The last time + S +Ved/cột 2 +was + time 

→ It's + time + since + S + last + Ved/cột 2 

$\text{3.}$ It's the first time Peter has heard classical music . 

→ This/It is the first time + S + has/have + Vpp 

→ S + has/have + never + Vpp + .... + before 

$\text{4.}$ I have never heard the silliest joke before . 

→ This/It is the first time + S + has/have + Vpp 

→ S + has/have + never + Vpp + .... + before 

$\text{5.}$I have learnt/learned English since the end of 2010. 

→ S + started/began + to V/V-ing + when/in/on/ago/.. + time

→ S + has/have + Vpp + for/since + time 

`1.`It's ages since I last saw Alice.

`->`S + have/has not + Vpp + since/for + time

`=`It's + time + since + S ( last ) + V2/ed

`2.`The last time she phoned me was 3 months ago.

`->`It's + time + since + S ( last ) + V2/ed

`=`The last time + S + V2/ed + was + time  ( thời gian trong quá khứ )

`3.`It's the first time Peter has heard classical music.

`->`S + have/has never + Vpp + before : chưa từng làm gì trước đây...

`=`It/This is the first time + S + have/has + Vpp

`4.`I have never heard a sillier joke than this before.

`->`S + have/has never + Vpp + before : chưa từng làm gì trước đây...

`=>`Tạm dịch : Tôi chưa từng nghe một trò đùa buồn tẻ hơn điều này trước đây.

`5.`I started learned English since the end of 2010.

`->`S + began + Ving/to V + time ( thời gian trọng quá khứ )

`=`S + have/has + Vpp + since/for + time