`1.` They wanted to apologize for their behavior: that's why they paid for dinner. (in order)

`->` They paid for dinner in order to apologize for their behavior.

`=>` in order to/ so as to + Vbare: để làm gì (mục đích)

`2.` It isn't necessary to bring drinks as they are included in the package. (have to)

`->` You don't have to bring drinks as they are included in the package.

`=>` don't have to + Vbare: không cần/ phải làm gì

3. Tom said, "I will be playing tennis when you arrive." (he)

`->` Tom said that he would be playing tennis when I arrived.

`=>` Reported speech: S + said (that) + S + V (lùi thì)

4. When I was a child, I would go to the park every Saturday afternoon. (used)

`->` When I was a child, I used to go to the park every Saturday afternoon.

`=>` used to + Vbare ~ would + Vbare: đã từng làm gì (trong quá khứ)

5. They moved to this suburb in 1990. (lived)

`->` They have lived in this suburb since 1990

`=>` HTHT: S + have/has + V3 + ...

6. Mike was interested in North American history in his school days. (interest)

`->` Mike had an interest in North American history in his school days.

`=>` to be interested in sth ~ have an interest in sth: quan tâm, thích thú điều gì

$\color{pink}{\text{209w'Darwin}}$

`color{red}{#lgdr}`

`1` They paid for dinner in order to apologize for their behavior .

`-` Mệnh đề chỉ lí do :

`@` S + V + O + to/so as to/in order to + V-inf + O .

`2` You don't have to bring drinks as they are included in the package .

`-` It's not necessary for O + to V + O : Nó không cần thiết đối với ai khi làm gì .

`=>` S + not have to/need to + V-inf + O : Ai đó không cần phải làm gì .

`3` Tom said that he would be playing tennis when I arrived .

`-` Gián tiếp tường thuật : S + said/told + O + that + S + V(lùi thì) + O .

`-` I `->` he .

`-` will `->` would .

`-` you `->` I .

`-` arrive `->` arrived .

`4` When I was a child , I used to go to the park every Saturday afternoon .

`-` S + used + to V + O : Ai đó đã từng làm gì nhưng đã bỏ .

`-` When + mệnh đề quá khứ đơn , mệnh đề quá khứ đơn .

`5` They have lived in the suburb since `1990` .

`-` since `1990` : DHNB thì hiện tại hoàn thành .

`->` Form : S + have/has + V3/Vpp + O .

`6` Mike had an interest in North American history in his school days .

`-` S + be + interested in + V-ing + O : Ai đó thích làm gì .

`=>` S + have + an interest + in + V-ing/N + O : Ai đó có sở thích làm gì .