When to look for possible survivors and rescue them after a huge
earthquake hit the island of Taiwan in the year of 1999, the
Taiwanese government sent troops, and helped organize volunteers
from all over the world to go into the region and perform rescue
missions.
前面部分
When to look for possible survivors and rescue them after a huge
earthquake hit the island of Taiwan.
雖然看得懂
但還是有點疑惑，以When 開頭 但馬上接to look
那主詞是?
還是說英文句子可以沒主詞?

1.動詞單複數變化完全依主詞而定，與受詞無關，也就是無需管their money。Each+N當主詞用的時候，代表每一個個體，後面動詞用單數，all+N當主詞用的時候，可代表所有每個個體如何，也可代表單一全體如何，依前後語意而定，也就是後面動詞可用單數亦可用複數，語意不同。對不起，上面推文貼錯位置

主詞似乎在第二句臺灣政府

同樓上 因和第二句主詞相同而省略了.When (gov was) to