1. So after hearing lee's amazing stories about Botswana, I dropped by t mission offices to drop off another check.

短語注釋1：drop by的意思是“順道拜訪，順便拜訪”。例如：

I'll drop by later to check on you. 等一下我會順道去看看你。

I am just going to drop by the post office . 我要順路到郵局一下。

短語注釋2：drop off是個固定短語，有多個意思。可以表示“不知不覺入睡，打瞌睡，睡著 ”。其英文解釋為：If you drop off to sleep, you go to sleep. 例如：

If I do drop off, wake me as soon as Martin arrives, won't you? 如果我確實睡著了，馬丁一到就叫醒我好嗎?

Just as I was dropping off, a strange thought crossed my mind. 就在我打瞌睡的時候,一個奇怪的念頭閃過我的腦海。

Drop off還可以表示“減少，減退”的意思。例如：

The daily toll of casualties has dropped off sharply. 每日傷亡人數已經大大減少。

The recession caused sales to drop off. 經濟不景氣使銷量下降。

Drop off還可以表示“脫落”的意思。例如：

The leaves began to drop off. 樹葉開始凋落了。

臺詞中的意思是基于第三個意思，引申為“撕下，撕扯”的意思。Drop off another check的意思是“私下另外一張支票”。劇情中是指Matt又給了一張支票給Lee去支持非洲貧民。

文法解析：after hearing lee's amazing stories about Botswana是現在分詞短語作時間狀語。

2. Now they have a pump in their village because of us.

短語注釋：because of的意思是“因為，由于”。例如：

She was blacklisted by all the major Hollywood studios because of her political views. 由于她的政見，所有好萊塢大制片公司都拒絕用她。

All flights have been canceled because of bad weather. 因天氣惡劣，所有航班均被取消。

3. I could volunteer for the next tour.

詞匯注釋：volunteer在這里是做動詞用，意思是“自愿地或無償地給予或提供（幫助﹑ 建議等）”。表示自愿參與......，使用其固定搭配模式：volunteer something for something。其中的something可以省略，即：volunteer for something。例如：

I volunteered to act as chauffeur. 我自愿充當汽車司機。

She volunteered （her services） for relief work. 她自愿參加救濟工作。