21. This is the first time I have met that man.
22. This is the first time my mom has been so happy.
23. It's the first time Nam has read that novel.
24. This is the first time I have worn Ao dai.
25. It's the first time Na has heard that story.
26. It's the frist time Mary has seen that notice.
→ CT: It/ This is the frist time + S + V(HTHT) + ...(bỏ "before")