1. Jack hasn't ridden a bike for a while

> The last time

> It has

2. How long have we not had dinner together?

> When did

> When was

`1`

`-` The last time Jack rode a bike was a time ago
`-` It has been a while Jack hasn't ridden a bike

`2` 

`-` When did we not have dinner together?

`-` When was the last time we had dinner together?

`-` CT :

The last time + S + V-qk +....

It + has/have + been + tg + S + hasn't/haven't + V-II

When did + S + not + V-inf +...?

When was + the last time + S + V-qk + ....?

$baoyen.$

`1`

`@` The last time Jack rode a bike was a while .

`@` It has been a while since Jack last rode a bike .

`-` S + have/has + not + V3/Vpp + O + time : Ai đó đã không làm gì trong bao lâu .

`->` The last time + S + V(quá khứ) + O + was + time : Lần cuối ai đó làm gì là khi nào .

`->` It + be + time + since + S + last + V(quá khứ) + O : Đã là bao lâu kể từ khi ai đó lần cuối làm gì .

`2`

`@` When did we not have dinner together `?`

`@` When was the last time we had dinner together `?`

`-` How long + have/has + S + not + V3/Vpp + O `?` : Ai đó đã không làm gì được bao lâu rồi `?`

`->` When + did + S + not + V-inf + O `?` : Ai đó đã không làm gì từ khi nào `?`

`->` When + was + the last time + S + V(quá khứ) + O `?` : Ai đó đã làm gì lần cuối khi nào `?`