1. when did you start working for this company => how long is it ..... 2. it is a long time since I last met him here => I haven't ........ 3. He began to play soccer when he was a child => he has .........

1. How long is it since he started working?

- When did + S + start + V-ing? : ai đó đã bắt đầu làm gì khi nào?

- How long + is it since + S + V2/V-ed? : ai đó đã làm gì bao lâu?

2. I haven't met him here for a long time.

- It's + time + since + S + last + V2/V-ed : Nó đã được ... kể từ khi ai đó lần cuối làm gì

= S + has/have + not + V-II + for/since + time : ai đã không làm gì bao lâu

3. He has played soccer since he was a child.

- S + began/started + V-ing/toV : ai đó đã bắt đầu làm gì

- S + has/have + V-II + for/since + time : ai đó đã làm gì bao lâu