`1.` Tom/learn/a lot/Vietnamese/people/since/he/arrive/here

`=>` Tom has learned a lot about Vietnamese people since he arrived here.

`-` since là dấu hiệu chia thì HTHT : S + have/has + P2 + ....

`-` HTHT, since + QKĐ: kể từ khi ....

`2.` Easter/joyful festival/celebrate/many countries

`=>` Easter is a joyful festival that is celebrated in many countries.

`-` That thay thế N chỉ cả người và vật , làm chủ ngữ / tân ngữ trong câu

`-` CBĐ : S + am/is/are + P2 by O

`1.` Tom has learned a lot about Vietnamese people since he arrived here.

`-` Thì HTHT - since là DHNB

`-` Cấu trúc: S + have/has + Vpp + ..

`2.` Easter is a joyful festival which is celebrated in many countries

`-` Cấu trúc bị động HTĐ: S + am/is/are + Vpp + .. +by O